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Schedule III Real Estate and Accumulated Depreciation [Schedule] (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Real estate investments:      
Balance at beginning of year $ 13,898,707 $ 13,656,807 $ 13,292,039
Acquisitions 56,327 105,730 130,187
Less: FMV of leases included in acquisitions   (512) (796)
Improvement and development 437,268 302,380 253,954
Disposition of real estate assets (53,407) (165,698) (18,577)
Balance at end of year 14,338,895 13,898,707 13,656,807
Accumulated depreciation:      
Balance at beginning of year 2,955,253 2,549,287 2,075,071
Depreciation 508,746 493,674 485,654
Disposition of real estate assets (48,894) (87,708) (11,438)
Balance at end of year $ 3,415,105 $ 2,955,253 $ 2,549,287