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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 securities.","units":{"USD":[{"start":"2012-01-01","end":"2012-06-30","val":17052000,"accn":"0001193125-12-344001","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":17277000,"accn":"0001193125-12-458770","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":225000,"accn":"0001193125-12-458770","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3"}]}},"CapitalLeasedAssetsGross":{"label":"Capital Leased Assets, Gross","description":"Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.","units":{"USD":[{"end":"2011-12-31","val":12007000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2011Q4I"},{"end":"2012-12-31","val":12007000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15"},{"end":"2012-12-31","val":12007000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2012Q4I"},{"end":"2013-12-31","val":12007000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14"},{"end":"2013-12-31","val":12007000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-12-31","val":12007000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeaseObligations":{"label":"Capital Lease Obligations","description":"Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":636000,"accn":"0001193125-14-299293","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2013-12-31","val":636000,"accn":"0001193125-14-404691","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10"},{"end":"2013-12-31","val":636000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-06-30","val":629000,"accn":"0001193125-14-299293","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07","frame":"CY2014Q2I"},{"end":"2014-09-30","val":630000,"accn":"0001193125-14-404691","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10","frame":"CY2014Q3I"},{"end":"2014-12-31","val":565000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDue":{"label":"Capital Leases, Future Minimum Payments Due","description":"Amount of minimum lease payments for capital leases.","units":{"USD":[{"end":"2012-12-31","val":1016000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":917000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":786000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueCurrent":{"label":"Capital Leases, Future Minimum Payments Due, Next Twelve Months","description":"Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":127000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":131000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":131000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInFiveYears":{"label":"Capital Leases, Future Minimum Payments Due in Five Years","description":"Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":127000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":131000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":131000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInFourYears":{"label":"Capital Leases, Future Minimum Payments Due in Four Years","description":"Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":127000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":131000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":131000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInThreeYears":{"label":"Capital Leases, Future Minimum Payments Due in Three Years","description":"Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":127000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":131000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":131000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInTwoYears":{"label":"Capital Leases, Future Minimum Payments Due in Two Years","description":"Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":127000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":131000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":131000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueThereafter":{"label":"Capital Leases, Future Minimum Payments Due Thereafter","description":"Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":381000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":262000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":131000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments":{"label":"Capital Leases, Future Minimum Payments, Interest Included in Payments","description":"Amount necessary to reduce net minimum lease payments to present value for capital leases.","units":{"USD":[{"end":"2012-12-31","val":340000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":281000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":221000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments":{"label":"Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments","description":"Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.","units":{"USD":[{"end":"2012-12-31","val":676000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":636000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":565000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation":{"label":"Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation","description":"The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.","units":{"USD":[{"end":"2011-12-31","val":6004000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15","frame":"CY2011Q4I"},{"end":"2012-12-31","val":7205000,"accn":"0001193125-13-061639","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-15"},{"end":"2012-12-31","val":7205000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14","frame":"CY2012Q4I"},{"end":"2013-12-31","val":8405000,"accn":"0001193125-14-052583","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-14"},{"end":"2013-12-31","val":8405000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-12-31","val":9606000,"accn":"0001193125-15-088144","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"}]}},"CashAcquiredFromAcquisition":{"label":"Cash Acquired from Acquisition","description":"The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":13667000,"accn":"0000950123-11-075285","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"start":"2010-01-01","end":"2010-09-30","val":13667000,"accn":"0000950123-11-096489","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"start":"2012-01-01","end":"2012-06-30","val":-10106000,"accn":"0001193125-13-322820","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"start":"2012-01-01","end":"2012-06-30","val":-10106000,"accn":"0001193125-12-344001","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":10106000,"accn":"0001193125-12-458770","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"}]}},"CashAndCashEquivalentsAtCarryingValue":{"label":"Cash and Cash Equivalents, at Carrying Value","description":"Amount of currency on hand as well as demand deposits with banks or financial institutions. 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