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Schedule III - Real Estate and Accumulated Depreciation - Reconciliation of Carrying Amount of Real Estate and Accumulated Depreciation (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 [Roll Forward]      
Beginning balance $ 7,269,128 $ 7,059,537 $ 6,644,249
Acquisitions 584,250 0 505,257
Improvements, capitalized costs 415,602 395,390 364,721
Total additions during period 999,852 395,390 869,978
Disposal (fully depreciated assets and early terminations) (53,963) (27,957) (27,821)
Impairment loss 0 (52,201) 0
Cost of property sold 0 (105,641) (426,869)
Total deductions during period (53,963) (185,799) (454,690)
Ending balance 8,215,017 7,269,128 7,059,537
Reclassification to assets associated with real estate held for sale 0 0 0
TOTAL INVESTMENT IN REAL ESTATE, END OF YEAR 8,215,017 7,269,128 7,059,537
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]      
Total accumulated depreciation, beginning of year (898,279) (695,631) (549,411)
Depreciation of real estate (258,732) (235,097) (203,347)
Total additions during period (258,732) (235,097) (203,347)
Deletions 54,263 26,533 27,410
Write-offs due to sale 0 5,916 29,717
Total deductions during period 54,263 32,449 57,127
Ending balance, before reclassification to assets associated with real estate held for sale (1,102,748) (898,279) (695,631)
Reclassification to assets associated with real estate held for sale 0 0 0
TOTAL ACCUMULATED DEPRECIATION, END OF YEAR $ (1,102,748) $ (898,279) $ (695,631)