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Schedule III - Real Estate and Accumulated Depreciation - Real Estate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at January 1 $ 3,444,676 $ 3,589,072 $ 3,763,310
Improvements and additions 183,269 145,238 126,664
Acquisitions through foreclosure 14,505 77,867 31,764
Other acquisitions 0 4,666 69,379
Dispositions 431,928 (341,453) (388,906)
Impairments (10,180) (30,714) (13,139)
Balance at December 31 $ 3,200,342 $ 3,444,676 $ 3,589,072