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Schedule III - Real Estate and Accumulated Depreciation (Real Estate Roll Forwards) (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 and Accumulated Depreciation Disclosure [Abstract]      
Total cost for federal tax purposes at end of each period $ 11,300,000    
Reconciliation of total real estate carrying value is as follows:      
Balance at beginning of period 10,123,600 $ 10,098,777 $ 10,921,491
Acquisitions and improvements 276,321 478,719 301,218
Real estate held for sale (21,927) (36,836) (4,148)
Impairment of real estate (19,551) (24,402) (45,828)
Cost of property sold or transferred to joint ventures (102,688) (305,380) (975,936)
Write-off of assets no longer in service (92,194) (87,278) (98,020)
Balance at end of period 10,163,561 10,123,600 10,098,777
Reconciliation of accumulated depreciation as follows:      
Balance at beginning of period 2,481,250 2,349,127 2,361,070
Depreciation expense 295,645 299,993 320,490
Property sold or transferred to joint ventures (42,658) (99,305) (252,319)
Write-off of assets no longer in service (74,789) (68,565) (80,114)
Balance at end of period $ 2,659,448 $ 2,481,250 $ 2,349,127