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Schedule III Real Estate and Accumulated Depreciation [Schedule] (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Real estate investments:      
Balance at beginning of year $ 13,656,807 $ 13,292,039 $ 12,972,170
Acquisitions 105,730 130,187 127,710
Less: FMV of leases included in acquisitions (512) (796) (1,488)
Improvement and development 302,380 253,954 322,829
Disposition of real estate assets (165,698) (18,577) (123,861)
Balance at end of year 13,898,707 13,656,807 13,292,039
Accumulated depreciation:      
Balance at beginning of year 2,549,287 2,075,071 1,674,801
Depreciation 493,674 485,654 463,590
Disposition of real estate assets (87,708) (11,438) (63,320)
Balance at end of year $ 2,955,253 $ 2,549,287 2,075,071
Disposal Group, Held-for-sale, Not Discontinued Operations      
Real estate investments:      
Balance at beginning of year     $ 5,321