SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of year	$ 4,039,536	$ 3,697,805	$ 3,466,482
Improvements and other	75,246	97,000	99,594
Property acquisitions	19,109	303,884	134,559
Property dispositions or held for sale assets	(19,659)	(84,243)	(34,666)
Right-of-use assets - finance leases obtained and reclassified	(76,965)	102,055
Capital lease reclassified as Right-of-use assets - finance lease		(76,965)
Consolidation of previously unconsolidated investments	129,863		31,836
Impairment charges	(72,842)
Balance at end of year	$ 4,094,288	$ 4,039,536	$ 3,697,805