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As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect 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Retirement Obligation, Revision of Estimate","description":"Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.","units":{"USD":[{"start":"2012-01-01","end":"2012-09-30","val":-5000,"accn":"0001047469-12-010332","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-12-31","val":-5000,"accn":"0001047469-13-003601","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29"},{"start":"2012-01-01","end":"2012-12-31","val":-5000,"accn":"0001047469-14-002156","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"start":"2012-01-01","end":"2012-12-31","val":-5000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2012"},{"start":"2013-01-01","end":"2013-09-30","val":341000,"accn":"0001047469-13-010477","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":341000,"accn":"0001047469-14-002156","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"start":"2013-01-01","end":"2013-12-31","val":341000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2013"}]}},"AssetRetirementObligationsNoncurrent":{"label":"Asset 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An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2009-12-31","val":3746000,"accn":"0001047469-13-003601","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29","frame":"CY2009Q4I"},{"end":"2010-12-31","val":4372000,"accn":"0001047469-11-007434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2010-12-31","val":4372000,"accn":"0001047469-11-009557","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":4372000,"accn":"0001047469-12-003711","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2010-12-31","val":4372000,"accn":"0001047469-13-003601","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29"},{"end":"2010-12-31","val":4372000,"accn":"0001047469-14-002156","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11","frame":"CY2010Q4I"},{"end":"2011-06-30","val":4620000,"accn":"0001047469-11-007434","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":4744000,"accn":"0001047469-11-009557","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":4868000,"accn":"0001047469-12-003711","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2011-12-31","val":4868000,"accn":"0001047469-12-006088","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":4868000,"accn":"0001047469-12-008316","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":4868000,"accn":"0001047469-12-010332","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":4868000,"accn":"0001047469-13-003601","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29"},{"end":"2011-12-31","val":4868000,"accn":"0001047469-14-002156","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"end":"2011-12-31","val":4868000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2011Q4I"},{"end":"2012-03-31","val":5007000,"accn":"0001047469-12-006088","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":5145000,"accn":"0001047469-12-008316","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":5278000,"accn":"0001047469-12-010332","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":5416000,"accn":"0001047469-13-003601","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-29"},{"end":"2012-12-31","val":5416000,"accn":"0001047469-13-005910","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":5416000,"accn":"0001047469-13-008194","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"end":"2012-12-31","val":5416000,"accn":"0001047469-13-010477","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":5416000,"accn":"0001047469-14-002156","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"end":"2012-12-31","val":5416000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2012Q4I"},{"end":"2013-03-31","val":5570000,"accn":"0001047469-13-005910","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":5724000,"accn":"0001047469-13-008194","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":6219000,"accn":"0001047469-13-010477","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":6385000,"accn":"0001047469-14-002156","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"end":"2013-12-31","val":6385000,"accn":"0001193125-14-182599","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-05"},{"end":"2013-12-31","val":6385000,"accn":"0001193125-14-306630","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-12"},{"end":"2013-12-31","val":6385000,"accn":"0001193125-14-409200","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":6385000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2013Q4I"},{"end":"2014-03-31","val":6861000,"accn":"0001193125-14-182599","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-05","frame":"CY2014Q1I"},{"end":"2014-06-30","val":7052000,"accn":"0001193125-14-306630","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-12","frame":"CY2014Q2I"},{"end":"2014-09-30","val":7244000,"accn":"0001193125-14-409200","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":7435000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04"},{"end":"2014-12-31","val":7435000,"accn":"0001193125-15-172031","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-05","frame":"CY2014Q4I"},{"end":"2015-03-31","val":7373000,"accn":"0001193125-15-172031","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-05","frame":"CY2015Q1I"}]}},"Assets":{"label":"Assets","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. 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Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2013-06-30","val":8000000,"accn":"0001047469-13-008194","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":8000000,"accn":"0001047469-13-010477","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":8000000,"accn":"0001047469-14-002156","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11"},{"end":"2013-12-31","val":8000000,"accn":"0001193125-14-182599","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-05"},{"end":"2013-12-31","val":8000000,"accn":"0001193125-14-306630","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-12"},{"end":"2013-12-31","val":8000000,"accn":"0001193125-14-409200","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":8000000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2013Q4I"},{"end":"2014-03-31","val":8000000,"accn":"0001193125-14-182599","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-05","frame":"CY2014Q1I"},{"end":"2014-06-30","val":13500000,"accn":"0001193125-14-306630","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-12","frame":"CY2014Q2I"},{"end":"2014-09-30","val":8000000,"accn":"0001193125-14-409200","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":8000000,"accn":"0001193125-15-076795","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04"},{"end":"2014-12-31","val":8000000,"accn":"0001193125-15-172031","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-05","frame":"CY2014Q4I"},{"end":"2015-03-31","val":8000000,"accn":"0001193125-15-172031","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-05","frame":"CY2015Q1I"}]}},"LongTermDebtCurrent":{"label":"Long-term Debt, Current Maturities","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. 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While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its 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Assets, Current","description":"Amount of current assets classified as 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