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Schedule III - Real Estate and Accumulated Depreciation - Real Estate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance at January 1 $ 2,997,351 $ 3,246,469 $ 3,448,934
Improvements and additions 167,676 169,999 183,269
Acquisitions through foreclosure 0 40,583 14,505
Other acquisitions 5,164 30,618 0
Dispositions (561,431) (484,810) (431,928)
Other 0 4,035 41,869
Impairments (31,565) (9,543) (10,180)
Balance at December 31 $ 2,577,195 $ 2,997,351 $ 3,246,469