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Schedule III - Real Estate and Accumulated Depreciation - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Land and Buildings and Improvements      
Balance at beginning of period $ 5,127,448 $ 5,903,906 $ 6,165,296
Add: Acquisitions 0 0 0
Add: Improvements 52,936 91,129 109,403
Less: Disposition of properties (6,075) (854,087) (370,793)
Less: Impairment loss 0 (13,500) 0
Balance at end of period 5,174,309 5,127,448 5,903,906
Reconciliation of Accumulated Depreciation      
Balance at beginning of period (706,040) (759,643) (628,518)
Add: Depreciation for the period (125,494) (131,442) (143,215)
Less: Disposition of properties 3,726 185,045 12,090
Balance at end of period $ (827,808) $ (706,040) $ (759,643)