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Retirement Obligation, Legally Restricted Assets, Fair Value","description":"Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.","units":{"USD":[{"end":"2011-06-30","val":25839000,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22","frame":"CY2011Q2I"},{"end":"2011-09-30","val":26206000,"accn":"0000950123-11-090585","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-19","frame":"CY2011Q3I"},{"end":"2011-12-31","val":28190000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08","frame":"CY2011Q4I"},{"end":"2012-03-31","val":28296000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1I"},{"end":"2012-06-30","val":28913000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2012Q2I"},{"end":"2012-09-30","val":30555000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2012Q3I"},{"end":"2012-12-31","val":32457000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2012Q4I"},{"end":"2013-03-31","val":32564000,"accn":"0001193125-13-171879","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-25","frame":"CY2013Q1I"},{"end":"2013-06-30","val":32722000,"accn":"0001193125-13-299541","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-24","frame":"CY2013Q2I"},{"end":"2013-09-30","val":32816000,"accn":"0001193125-13-407286","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-23","frame":"CY2013Q3I"},{"end":"2013-12-31","val":33466000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2013Q4I"},{"end":"2014-03-31","val":35530000,"accn":"0001144204-14-023849","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-21","frame":"CY2014Q1I"},{"end":"2014-06-30","val":35635000,"accn":"0001144204-14-043919","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-21","frame":"CY2014Q2I"},{"end":"2014-09-30","val":36016000,"accn":"0001144204-14-062226","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22","frame":"CY2014Q3I"},{"end":"2014-12-31","val":38107000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10","frame":"CY2014Q4I"},{"end":"2015-03-31","val":39336000,"accn":"0001144204-15-025390","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-28","frame":"CY2015Q1I"},{"end":"2015-06-30","val":38822000,"accn":"0001144204-15-044455","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-28","frame":"CY2015Q2I"},{"end":"2015-09-30","val":39511000,"accn":"0001144204-15-063129","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":43636000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2015Q4I"},{"end":"2016-03-31","val":43413000,"accn":"0001144204-16-096731","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-28","frame":"CY2016Q1I"}]}},"AssetRetirementObligationLiabilitiesIncurred":{"label":"Asset 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date.","units":{"USD":[{"end":"2010-12-31","val":3928000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2010Q4I"},{"end":"2011-09-30","val":22272000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2011Q3I"},{"end":"2011-12-31","val":22486000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2011Q4I"},{"end":"2012-03-31","val":602000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1I"},{"end":"2012-06-30","val":602000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2012Q2I"},{"end":"2012-09-30","val":21314000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2012Q3I"}]}},"BusinessAcquisitionProFormaEarningsPerShareBasic":{"label":"Business Acquisition, Pro Forma Earnings Per Share, Basic","description":"The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.","units":{"USD/shares":[{"start":"2011-01-01","end":"2011-12-31","val":1.63,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2011-01-01","end":"2011-12-31","val":1.63,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1.35,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2012-01-01","end":"2012-12-31","val":1.35,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10"},{"start":"2012-01-01","end":"2012-12-31","val":1.35,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10","frame":"CY2012"}]}},"BusinessAcquisitionProFormaEarningsPerShareDiluted":{"label":"Business Acquisition, Pro Forma Earnings Per Share, Diluted","description":"The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.","units":{"USD/shares":[{"start":"2011-01-01","end":"2011-12-31","val":1.62,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2011-01-01","end":"2011-12-31","val":1.62,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1.35,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2012-01-01","end":"2012-12-31","val":1.35,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10"},{"start":"2012-01-01","end":"2012-12-31","val":1.35,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10","frame":"CY2012"}]}},"BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount":{"label":"Business Acquisition, Goodwill, Expected Tax Deductible Amount","description":"The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.","units":{"USD":[{"end":"2009-12-31","val":40535000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08","frame":"CY2009Q4I"},{"end":"2010-06-30","val":2254000,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22","frame":"CY2010Q2I"},{"end":"2010-09-30","val":4382000,"accn":"0000950123-11-090585","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-19","frame":"CY2010Q3I"},{"end":"2010-12-31","val":21948000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08","frame":"CY2010Q4I"},{"end":"2011-03-31","val":780000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2011Q1I"},{"end":"2011-06-30","val":11947000,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22"},{"end":"2011-06-30","val":11947000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2011Q2I"},{"end":"2011-09-30","val":16739000,"accn":"0000950123-11-090585","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-19"},{"end":"2011-09-30","val":16739000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2011Q3I"},{"end":"2011-12-31","val":24242000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08"},{"end":"2011-12-31","val":24242000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2011Q4I"},{"end":"2012-03-31","val":59637000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1I"},{"end":"2012-06-30","val":65709000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2012Q2I"},{"end":"2012-09-30","val":66971000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2012Q3I"},{"end":"2013-12-31","val":39731000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10"},{"end":"2013-12-31","val":39731000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10"},{"end":"2013-12-31","val":39731000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2013Q4I"},{"end":"2014-12-31","val":18778000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10"},{"end":"2014-12-31","val":18778000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2014Q4I"},{"end":"2015-12-31","val":40863000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2015Q4I"}]}},"BusinessAcquisitionsProFormaNetIncomeLoss":{"label":"Business Acquisition, Pro Forma Net Income (Loss)","description":"The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":184109000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2011-01-01","end":"2011-12-31","val":184109000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":164176000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2012-01-01","end":"2012-12-31","val":164176000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10"},{"start":"2012-01-01","end":"2012-12-31","val":164176000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10","frame":"CY2012"}]}},"BusinessAcquisitionsProFormaRevenue":{"label":"Business Acquisition, Pro Forma Revenue","description":"The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":1792220000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2011-01-01","end":"2011-12-31","val":1792220000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1866458000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"start":"2012-01-01","end":"2012-12-31","val":1866458000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10"},{"start":"2012-01-01","end":"2012-12-31","val":1866458000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10","frame":"CY2012"}]}},"BusinessCombinationAcquiredReceivablesEstimatedUncollectible":{"label":"Business Combination, Acquired Receivables, Estimated Uncollectible","description":"For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.","units":{"USD":[{"end":"2010-06-30","val":6000,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22","frame":"CY2010Q2I"},{"end":"2010-09-30","val":284000,"accn":"0000950123-11-090585","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-19","frame":"CY2010Q3I"},{"end":"2010-12-31","val":453000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08"},{"end":"2010-12-31","val":453000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2010Q4I"},{"end":"2011-03-31","val":56000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2011Q1I"},{"end":"2011-06-30","val":660000,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22"},{"end":"2011-06-30","val":660000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2011Q2I"},{"end":"2011-09-30","val":607000,"accn":"0000950123-11-090585","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-19"},{"end":"2011-09-30","val":607000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2011Q3I"},{"end":"2011-12-31","val":619000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08"},{"end":"2011-12-31","val":619000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2011-12-31","val":619000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2011Q4I"},{"end":"2012-03-31","val":28000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1I"},{"end":"2012-06-30","val":20000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2012Q2I"},{"end":"2012-09-30","val":143000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2012Q3I"},{"end":"2013-12-31","val":203000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10"},{"end":"2013-12-31","val":203000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2013Q4I"},{"end":"2014-12-31","val":196000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10"},{"end":"2014-12-31","val":196000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2014Q4I"},{"end":"2015-12-31","val":466000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2015Q4I"}]}},"BusinessCombinationAcquiredReceivablesGrossContractualAmount":{"label":"Business Combination, Acquired Receivables, Gross Contractual Amount","description":"For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.","units":{"USD":[{"end":"2010-06-30","val":474000,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22","frame":"CY2010Q2I"},{"end":"2010-09-30","val":1470000,"accn":"0000950123-11-090585","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-19","frame":"CY2010Q3I"},{"end":"2010-12-31","val":4317000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08"},{"end":"2010-12-31","val":4317000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2010Q4I"},{"end":"2011-03-31","val":239000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2011Q1I"},{"end":"2011-06-30","val":9461000,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22"},{"end":"2011-06-30","val":9461000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2011Q2I"},{"end":"2011-09-30","val":10019000,"accn":"0000950123-11-090585","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-19"},{"end":"2011-09-30","val":10019000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2011Q3I"},{"end":"2011-12-31","val":10232000,"accn":"0000950123-12-002148","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-08"},{"end":"2011-12-31","val":10232000,"accn":"0001193125-13-085841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01"},{"end":"2011-12-31","val":10232000,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2011Q4I"},{"end":"2012-03-31","val":6343000,"accn":"0001193125-12-183644","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1I"},{"end":"2012-06-30","val":7093000,"accn":"0001193125-12-311198","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-24","frame":"CY2012Q2I"},{"end":"2012-09-30","val":10708000,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2012Q3I"},{"end":"2013-12-31","val":414000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10"},{"end":"2013-12-31","val":414000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2013Q4I"},{"end":"2014-12-31","val":3981000,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10"},{"end":"2014-12-31","val":3981000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2014Q4I"},{"end":"2015-12-31","val":13037000,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2015Q4I"}]}},"BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue":{"label":"Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value","description":"This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition 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Combination, Acquisition Related Costs","description":"This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity 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Y","form":"10-K","filed":"2016-02-09"},{"end":"2015-12-31","val":294746000,"accn":"0001144204-16-096731","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-28","frame":"CY2015Q4I"},{"end":"2016-03-31","val":288527000,"accn":"0001144204-16-096731","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-28","frame":"CY2016Q1I"}]}},"FiniteLivedIntangibleAssetsUsefulLifeMaximum":{"label":"Finite-Lived 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An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.","units":{"Segment":[{"start":"2013-01-01","end":"2013-09-30","val":4,"accn":"0001193125-13-407286","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-23"}],"segment":[{"start":"2012-10-01","end":"2012-10-31","val":3,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10"},{"start":"2013-01-01","end":"2013-12-31","val":4,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":4,"accn":"0001144204-14-023849","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-21","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":4,"accn":"0001144204-14-043919","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-21"},{"start":"2014-01-01","end":"2014-09-30","val":4,"accn":"0001144204-14-062226","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22"},{"start":"2014-01-01","end":"2014-12-31","val":4,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":4,"accn":"0001144204-15-025390","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-28","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":4,"accn":"0001144204-15-044455","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-28"},{"start":"2015-01-01","end":"2015-09-30","val":4,"accn":"0001144204-15-063129","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"start":"2015-01-01","end":"2015-12-31","val":4,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":4,"accn":"0001144204-16-096731","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-28","frame":"CY2016Q1"}]}},"NumberOfReportableSegments":{"label":"Number of Reportable Segments","description":"Number of segments reported by the entity. 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Does not include preferred shares that have been repurchased.","units":{"shares":[{"end":"2009-12-31","val":0,"accn":"0000950123-10-066692","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-21"},{"end":"2009-12-31","val":0,"accn":"0000950123-10-094313","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-20"},{"end":"2009-12-31","val":0,"accn":"0000950123-11-010546","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-09","frame":"CY2009Q4I"},{"end":"2010-06-30","val":0,"accn":"0000950123-10-066692","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-21","frame":"CY2010Q2I"},{"end":"2010-09-30","val":0,"accn":"0000950123-10-094313","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-20","frame":"CY2010Q3I"},{"end":"2010-12-31","val":0,"accn":"0000950123-11-010546","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-09"},{"end":"2010-12-31","val":0,"accn":"0000950123-11-038898","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-26"},{"end":"2010-12-31","val":0,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22","frame":"CY2010Q4I"},{"end":"2011-03-31","val":0,"accn":"0000950123-11-038898","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-26","frame":"CY2011Q1I"},{"end":"2011-06-30","val":0,"accn":"0000950123-11-067528","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-22","frame":"CY2011Q2I"},{"end":"2011-12-31","val":0,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2011Q4I"},{"end":"2012-09-30","val":0,"accn":"0001193125-12-430763","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-23","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-007263","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-10"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-023849","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-21"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-043919","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-21"},{"end":"2013-12-31","val":0,"accn":"0001144204-14-062226","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22"},{"end":"2013-12-31","val":0,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10","frame":"CY2013Q4I"},{"end":"2014-03-31","val":0,"accn":"0001144204-14-023849","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-21","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0,"accn":"0001144204-14-043919","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-21","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0,"accn":"0001144204-14-062226","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0,"accn":"0001144204-15-007232","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-10"},{"end":"2014-12-31","val":0,"accn":"0001144204-15-025390","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-28"},{"end":"2014-12-31","val":0,"accn":"0001144204-15-044455","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-28"},{"end":"2014-12-31","val":0,"accn":"0001144204-15-063129","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"end":"2014-12-31","val":0,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0,"accn":"0001144204-15-025390","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-28","frame":"CY2015Q1I"},{"end":"2015-06-30","val":0,"accn":"0001144204-15-044455","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-28","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0,"accn":"0001144204-15-063129","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0,"accn":"0001144204-16-079708","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-09"},{"end":"2015-12-31","val":0,"accn":"0001144204-16-096731","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-28","frame":"CY2015Q4I"},{"end":"2016-03-31","val":0,"accn":"0001144204-16-096731","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-28","frame":"CY2016Q1I"}]}},"PreferredStockValue":{"label":"Preferred Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' 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