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Schedule III - Real Estate and Accumulated Depreciation - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Land and Buildings and Improvements      
Balance at beginning of period $ 5,174,309 $ 5,127,448 $ 5,903,906
Add: Acquisitions 182,950 0 0
Add: Improvements 34,511 52,936 91,129
Less: Disposition of properties (269,362) (6,075) (854,087)
Less: Impairment losses (144,845) 0 (13,500)
Balance at end of period 4,977,563 5,174,309 5,127,448
Reconciliation of Accumulated Depreciation      
Balance at beginning of period (827,808) (706,040) (759,643)
Add: Depreciation for the period (126,759) (125,494) (131,442)
Less: Disposition of properties 83,826 3,726 185,045
Balance at end of period $ (870,741) $ (827,808) $ (706,040)