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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, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance, beginning of year $ 3,079,616 $ 3,633,376 $ 3,949,431
Acquisitions 63,570 57,494 0
Improvements 39,544 52,713 68,349
Impairment 0 (56,948) (73,198)
Disposals (45,748) (607,019) (311,206)
Balance, end of year 3,136,982 $ 3,079,616 $ 3,633,376
Federal income tax basis $ 2,300,000