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Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2015-12-31","val":98604000,"accn":"0001193125-19-076902","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":45536000,"accn":"0001193125-19-076902","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2016Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2016-01-01","end":"2016-12-31","val":-53068000,"accn":"0001193125-19-076902","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2016"}]}},"CashUninsuredAmount":{"label":"Cash, Uninsured Amount","description":"The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance 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Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.","units":{"USD/shares":[{"start":"2010-01-01","end":"2010-12-31","val":-71.06,"accn":"0001445305-12-000541","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2010-01-01","end":"2010-12-31","val":-71.06,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2010"},{"start":"2010-10-01","end":"2010-12-31","val":-23410,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2010Q4"},{"start":"2011-01-01","end":"2011-03-31","val":-1.27,"accn":"0001474464-12-000004","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"start":"2011-01-01","end":"2011-03-31","val":-1270,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2011-01-01","end":"2011-03-31","val":-1.27,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-2.03,"accn":"0001144204-11-046103","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-2.03,"accn":"0001474464-12-000014","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2011-04-01","end":"2011-06-30","val":-0.91,"accn":"0001144204-11-046103","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":-0.91,"accn":"0001474464-12-000014","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2011-04-01","end":"2011-06-30","val":-910,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2011-04-01","end":"2011-06-30","val":-0.91,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-1.8,"accn":"0001445305-11-003402","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"2011-01-01","end":"2011-09-30","val":-1.8,"accn":"0001474464-12-000019","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"start":"2011-07-01","end":"2011-09-30","val":-0.26,"accn":"0001474464-12-000019","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"start":"2011-07-01","end":"2011-09-30","val":-260,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2011-07-01","end":"2011-09-30","val":-0.26,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-2.31,"accn":"0001445305-12-000541","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2011-01-01","end":"2011-12-31","val":-2.31,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2011-01-01","end":"2011-12-31","val":-2.31,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2011-10-01","end":"2011-12-31","val":-0.26,"accn":"0001445305-11-003402","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"2011-10-01","end":"2011-12-31","val":-560,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2011-10-01","end":"2011-12-31","val":-0.56,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011Q4"},{"start":"2012-01-01","end":"2012-03-31","val":-0.08,"accn":"0001474464-12-000004","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":-80,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2012-01-01","end":"2012-03-31","val":-0.08,"accn":"0001474464-13-000015","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":-0.08,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2012-01-01","end":"2012-03-31","val":-0.08,"accn":"0001474464-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-11","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-0.2,"accn":"0001474464-12-000014","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-04-01","end":"2012-06-30","val":-0.11,"accn":"0001474464-12-000014","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-04-01","end":"2012-06-30","val":-110,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2012-04-01","end":"2012-06-30","val":-0.11,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2012-04-01","end":"2012-06-30","val":-0.11,"accn":"0001474464-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-11","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":-0.29,"accn":"0001474464-12-000019","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"start":"2012-07-01","end":"2012-09-30","val":-0.09,"accn":"0001474464-12-000019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Amount excludes temporary equity. Alternate caption for the concept is permanent 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Excludes employee stock ownership plan (ESOP).","units":{"USD":[{"start":"2012-01-01","end":"2012-06-30","val":5000,"accn":"0001474464-12-000014","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-01-01","end":"2012-09-30","val":48000,"accn":"0001474464-12-000019","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"start":"2012-01-01","end":"2012-12-31","val":180000,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":25000,"accn":"0001474464-13-000015","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":47000,"accn":"0001474464-13-000019","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2013-01-01","end":"2013-09-30","val":202000,"accn":"0001474464-13-000025","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"}]}},"StockRepurchasedDuringPeriodShares":{"label":"Stock Repurchased During Period, Shares","description":"Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"shares":[{"start":"2009-10-06","end":"2012-12-31","val":84199,"accn":"0001474464-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"start":"2010-08-23","end":"2012-12-31","val":84199,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2013-01-01","end":"2013-12-31","val":195395,"accn":"0001474464-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2013"},{"start":"2009-10-06","end":"2014-12-31","val":284594,"accn":"0001474464-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"start":"2014-01-01","end":"2014-12-31","val":284594,"accn":"0001474464-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-11"},{"start":"2014-01-01","end":"2014-12-31","val":5000,"accn":"0001474464-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2014"}]}},"StockRepurchasedDuringPeriodValue":{"label":"Stock Repurchased During Period, Value","description":"Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":25000,"accn":"0001445305-12-000541","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2011-01-01","end":"2011-12-31","val":25000,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-113000,"accn":"0001474464-12-000004","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":25000,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":161000,"accn":"0001474464-12-000014","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-01-01","end":"2012-09-30","val":371000,"accn":"0001474464-12-000019","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"start":"2012-01-01","end":"2012-12-31","val":-781000,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2012-01-01","end":"2012-12-31","val":781000,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":781000,"accn":"0001474464-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-11","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":587000,"accn":"0001474464-13-000015","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":1030000,"accn":"0001474464-13-000019","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2013-01-01","end":"2013-09-30","val":1389000,"accn":"0001474464-13-000025","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2013-01-01","end":"2013-12-31","val":-1886000,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2013-01-01","end":"2013-12-31","val":1886000,"accn":"0001474464-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-11"},{"start":"2013-01-01","end":"2013-12-31","val":1886000,"accn":"0001474464-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":50000,"accn":"0001474464-14-000021","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":153763000,"accn":"0001474464-14-000025","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"start":"2014-01-01","end":"2014-09-30","val":153763000,"accn":"0001474464-14-000033","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04"},{"start":"2014-01-01","end":"2014-12-31","val":153763000,"accn":"0001474464-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-11"},{"start":"2014-01-01","end":"2014-12-31","val":153763000,"accn":"0001474464-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2014"}]}},"StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased":{"label":"Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased","description":"The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.","units":{"shares":[{"end":"2012-12-31","val":41389,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2012Q4I"}]}},"TaxBasisOfInvestmentsCostForIncomeTaxPurposes":{"label":"Tax Basis of Investments, Cost for Income Tax Purposes","description":"The aggregate cost of investments for Federal income tax purposes.","units":{"USD":[{"end":"2012-12-31","val":348500000,"accn":"0001474464-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1500000000,"accn":"0001474464-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1700000000,"accn":"0001474464-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-05-11","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1700000000,"accn":"0001474464-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1600000000,"accn":"0001474464-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2016Q4I"},{"end":"2017-12-31","val":1540000,"accn":"0001193125-18-066868","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2017Q4I"}]}},"TenantReimbursements":{"label":"Tenant Reimbursements (Deprecated 2018-01-31)","description":"In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. 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