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Schedule III - Consolidated Real Estate and Accumulated Depreciation - Changes in Investment Properties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance, beginning of year $ 3,633,376 $ 3,949,431 $ 3,988,819
Acquisitions 57,494 0 0
Improvements 52,713 68,349 78,947
Impairment (56,948) (73,198) (10,897)
Disposals (607,019) (311,206) (107,438)
Balance, end of year 3,079,616 $ 3,633,376 $ 3,949,431
Federal income tax basis $ 2,300,000