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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 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":191436538,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":189144780,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":289258265,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":60520888,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":95352442,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":4397551,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":39773990,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":14648701,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":5370886,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":72987162,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":39941535,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":17158868,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. 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Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"\"Part noncash\"\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.\"","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":41602373,"accn":"0001178862-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":0,"accn":"0001178862-11-000025","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":0,"accn":"0001178862-11-000032","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001178862-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":50872722,"accn":"0001178862-12-000012","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-50872722,"accn":"0001178862-11-000025","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":50872722,"accn":"0001178862-12-000022","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-01-01","end":"2011-09-30","val":-50872722,"accn":"0001178862-11-000032","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"2011-01-01","end":"2011-09-30","val":50872722,"accn":"0001178862-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-15"},{"start":"2011-01-01","end":"2011-12-31","val":51801690,"accn":"0001178862-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-12-31","val":51801690,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2011-01-01","end":"2011-12-31","val":51801690,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0001178862-12-000012","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0001178862-12-000022","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0001178862-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-15"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0001178862-14-000014","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0001178862-14-000030","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0001178862-14-000038","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2013-01-01","end":"2013-12-31","val":5600000,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":5600000,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":129560979,"accn":"0001178862-14-000014","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"start":"2014-01-01","end":"2014-03-31","val":129560979,"accn":"0001178862-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":129560979,"accn":"0001178862-14-000030","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":129560979,"accn":"0001178862-15-000023","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":129560979,"accn":"0001178862-14-000038","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-01-01","end":"2014-12-31","val":178384392,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":53485875,"accn":"0001178862-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":53485875,"accn":"0001178862-15-000023","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"}]}},"NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1":{"label":"Noncash 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Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"\"Part noncash\"\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the 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Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"\"Part noncash\"\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the 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Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation","description":"Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real 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Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Investment in Real Estate Sold","description":"Amount of decrease to accumulated depreciation for real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":19258479,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":19579758,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":77017673,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014"}]}},"RealEstateAndAccumulatedDepreciationAccumulatedDepreciation":{"label":"Real Estate and Accumulated Depreciation, Accumulated Depreciation (Deprecated 2013-01-31)","description":"The amount of accumulated depreciation for the property as of the balance sheet date.","units":{"USD":[{"end":"2011-12-31","val":227600092,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2011-12-31","val":227600092,"accn":"0001178862-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-15"},{"end":"2011-12-31","val":227600092,"accn":"0001178862-12-000022","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2012-06-30","val":237761571,"accn":"0001178862-12-000022","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":244530688,"accn":"0001178862-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-15","frame":"CY2012Q3I"},{"end":"2012-12-31","val":235825752,"accn":"0001178862-13-000022","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2012Q4I"},{"end":"2012-12-31","val":235825752,"accn":"0001178862-13-000015","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"end":"2012-12-31","val":235825752,"accn":"0001178862-13-000011","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":235825752,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-03-31","val":242455812,"accn":"0001178862-13-000011","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":229570535,"accn":"0001178862-13-000015","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":235968144,"accn":"0001178862-13-000022","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"}]}},"RealEstateAndAccumulatedDepreciationAmountOfEncumbrances":{"label":"SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances","description":"Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate.","units":{"USD":[{"end":"2012-12-31","val":478185998,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":475525480,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":436785408,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovements":{"label":"Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements (Deprecated 2013-01-31)","description":"Gross amount at which land and buildings and improvements are carried at the end of the period for each property.","units":{"USD":[{"end":"2012-12-31","val":638824856,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"}]}},"RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts":{"label":"SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Cost","description":"Amount of cost capitalized subsequent to acquisition for real estate investment property, including, but not limited to, real estate tax and insurance, by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes initial purchase price and improvement, and real estate not held as investment or interest.","units":{"USD":[{"end":"2012-12-31","val":168800497,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":176733315,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":171474389,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"RealEstateCostOfRealEstateSold":{"label":"SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold","description":"Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":51945050,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":31901326,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":183726759,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014"}]}},"RealEstateFederalIncomeTaxBasis":{"label":"SEC Schedule III, Real Estate, Federal Income Tax Basis","description":"Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate.","units":{"USD":[{"end":"2010-12-31","val":487726557,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2010Q4I"},{"end":"2011-12-31","val":490584110,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2011-12-31","val":490584110,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2011Q4I"},{"end":"2012-12-31","val":449001683,"accn":"0001178862-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":449001683,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2012-12-31","val":449001683,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012Q4I"},{"end":"2013-12-31","val":436843695,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2013-12-31","val":436843695,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":404024751,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"RealEstateGrossAtCarryingValue":{"label":"SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross","description":"Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest.","units":{"USD":[{"end":"2011-12-31","val":650262329,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2011Q4I"},{"end":"2012-12-31","val":638824856,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012Q4I"},{"end":"2013-12-31","val":623955057,"accn":"0001178862-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2013-12-31","val":623955057,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":663935923,"accn":"0001178862-15-000012","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"RealEstateInvestmentPropertyAccumulatedDepreciation":{"label":"Real Estate Investment Property, Accumulated Depreciation","description":"The cumulative amount of depreciation for real estate property held for investment 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