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This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease.","units":{"USD":[{"end":"2010-12-31","val":37780000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"},{"end":"2011-12-31","val":37026000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2011-12-31","val":37026000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2011Q4I"},{"end":"2012-12-31","val":36291000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25"},{"end":"2012-12-31","val":36291000,"accn":"0000890319-14-000033","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":37478000,"accn":"0000890319-14-000033","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":39529000,"accn":"0000890319-15-000034","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":27454000,"accn":"0000890319-15-000034","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2014-12-31","val":27454000,"accn":"0000890319-16-000202","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23","frame":"CY2014Q4I"},{"end":"2015-12-31","val":29097000,"accn":"0000890319-16-000202","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23"},{"end":"2015-12-31","val":29097000,"accn":"0000890319-17-000037","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-23","frame":"CY2015Q4I"},{"end":"2016-12-31","val":35939000,"accn":"0000890319-17-000037","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-23"},{"end":"2016-12-31","val":35939000,"accn":"0000890319-18-000027","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016Q4I"},{"end":"2017-12-31","val":39252000,"accn":"0000890319-18-000027","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27"},{"end":"2017-12-31","val":39252000,"accn":"0000890319-19-000030","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":52507000,"accn":"0000890319-19-000030","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28"},{"end":"2018-12-31","val":52507000,"accn":"0000890319-20-000023","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2018Q4I"},{"end":"2019-12-31","val":59552000,"accn":"0000890319-20-000023","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"}]}},"DeferredCostsLeasingNet":{"label":"Deferred Costs, Leasing, Net","description":"This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization.","units":{"USD":[{"end":"2010-12-31","val":20498000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"},{"end":"2011-12-31","val":19767000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2011-12-31","val":19767000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2011Q4I"},{"end":"2012-12-31","val":19819000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25"},{"end":"2012-12-31","val":19819000,"accn":"0000890319-14-000033","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":19098000,"accn":"0000890319-14-000033","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":22722000,"accn":"0000890319-15-000034","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":16795000,"accn":"0000890319-15-000034","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2014-12-31","val":16795000,"accn":"0000890319-16-000202","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23","frame":"CY2014Q4I"},{"end":"2015-12-31","val":18395000,"accn":"0000890319-16-000202","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23"},{"end":"2015-12-31","val":18395000,"accn":"0000890319-17-000037","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-23","frame":"CY2015Q4I"},{"end":"2016-12-31","val":25420000,"accn":"0000890319-17-000037","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-23"},{"end":"2016-12-31","val":25420000,"accn":"0000890319-18-000027","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016Q4I"},{"end":"2017-12-31","val":30029000,"accn":"0000890319-18-000027","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27"},{"end":"2017-12-31","val":30029000,"accn":"0000890319-19-000030","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":44930000,"accn":"0000890319-19-000030","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28"},{"end":"2018-12-31","val":44930000,"accn":"0000890319-20-000023","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2018Q4I"},{"end":"2019-12-31","val":49648000,"accn":"0000890319-20-000023","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"}]}},"DeferredFederalIncomeTaxExpenseBenefit":{"label":"Deferred 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Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.","units":{"USD":[{"end":"2010-12-31","val":7600000,"accn":"0000890319-11-000037","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-01","frame":"CY2010Q4I"},{"end":"2010-12-31","val":7600000,"accn":"0000890319-11-000030","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29"},{"end":"2011-06-30","val":6900000,"accn":"0000890319-11-000030","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-29","frame":"CY2011Q2I"},{"end":"2011-09-30","val":8300000,"accn":"0000890319-11-000037","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-01","frame":"CY2011Q3I"},{"end":"2011-12-31","val":5900000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2011Q4I"},{"end":"2011-12-31","val":5900000,"accn":"0000890319-12-000100","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-29"},{"end":"2011-12-31","val":5900000,"accn":"0000890319-12-000062","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-30"},{"end":"2011-12-31","val":5900000,"accn":"0000890319-12-000022","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03"},{"end":"2011-12-31","val":5900000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2012-03-31","val":6100000,"accn":"0000890319-12-000022","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03","frame":"CY2012Q1I"},{"end":"2012-06-30","val":4500000,"accn":"0000890319-12-000062","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-30","frame":"CY2012Q2I"},{"end":"2012-09-30","val":4600000,"accn":"0000890319-12-000100","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-29","frame":"CY2012Q3I"}]}},"ExtinguishmentOfDebtGainLossNetOfTax":{"label":"Extinguishment of Debt, Gain (Loss), Net of Tax","description":"The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":174171000,"accn":"0000890319-14-000033","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":174171000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25"},{"start":"2011-01-01","end":"2011-12-31","val":174171000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"}]}},"FiniteLivedIntangibleAssetAcquiredInPlaceLeases":{"label":"Finite-Lived Intangible Asset, Acquired-in-Place Leases","description":"This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.","units":{"USD":[{"end":"2011-12-31","val":29632000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"end":"2011-12-31","val":29632000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2011Q4I"},{"end":"2012-12-31","val":22751000,"accn":"0000890319-13-000025","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25"},{"end":"2012-12-31","val":22751000,"accn":"0000890319-14-000033","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":20275000,"accn":"0000890319-14-000033","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":16651000,"accn":"0000890319-15-000034","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":11765000,"accn":"0000890319-15-000034","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"end":"2014-12-31","val":11765000,"accn":"0000890319-16-000202","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23","frame":"CY2014Q4I"},{"end":"2015-12-31","val":8525000,"accn":"0000890319-16-000202","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-23"},{"end":"2015-12-31","val":8525000,"accn":"0000890319-17-000037","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-23","frame":"CY2015Q4I"},{"end":"2016-12-31","val":6264000,"accn":"0000890319-17-000037","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-23"},{"end":"2016-12-31","val":6264000,"accn":"0000890319-18-000027","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016Q4I"},{"end":"2017-12-31","val":4462000,"accn":"0000890319-18-000027","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27"},{"end":"2017-12-31","val":4462000,"accn":"0000890319-19-000030","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":3122000,"accn":"0000890319-19-000030","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28"},{"end":"2018-12-31","val":3122000,"accn":"0000890319-20-000023","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2018Q4I"},{"end":"2019-12-31","val":1766000,"accn":"0000890319-20-000023","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"}]}},"FiniteLivedIntangibleAssetsNet":{"label":"Finite-Lived Intangible Assets, Net","description":"Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.","units":{"USD":[{"end":"2010-12-31","val":252000,"accn":"0000890319-12-000004","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"}]}},"GainLossOnDispositionOfAssets1":{"label":"Gain (Loss) on Disposition of Assets","description":"Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.","units":{"USD":[{"start":"2019-01-01","end":"2019-09-30","val":138696000,"accn":"0000890319-20-000106","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09"},{"start":"2019-07-01","end":"2019-09-30","val":138696000,"accn":"0000890319-20-000106","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09","frame":"CY2019Q3"},{"start":"2020-01-01","end":"2020-09-30","val":11277000,"accn":"0000890319-20-000106","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09"},{"start":"2020-07-01","end":"2020-09-30","val":0,"accn":"0000890319-20-000106","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09","frame":"CY2020Q3"}]}},"GainLossOnSaleOfProperties":{"label":"Gain (Loss) on Sale of Properties","description":"The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. 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