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Schedule III - Real Estate and Accumulated Depreciation - Real Estate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at January 1 $ 3,200,342 $ 3,444,676 $ 3,589,072
Improvements and additions 169,999 183,269 145,238
Acquisitions through foreclosure 40,583 14,505 77,867
Other acquisitions 30,618 0 4,666
Dispositions (484,810) (431,928) (341,453)
Impairments (9,543) (10,180) (30,714)
Balance at December 31 $ 2,947,189 $ 3,200,342 $ 3,444,676