SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of year	$ 3,697,805	$ 3,466,482	$ 3,382,000
Improvements and other	97,000	99,594	55,763
Property acquisitions	303,884	134,559	179,292
Property dispositions or held for sale assets	(84,243)	(34,666)	(189,895)
Right-of-use assets - operating leases obtained	62,020
Right-of-use assets - finance leases obtained and reclassified	102,055
Capital lease reclassified as Right-of-use assets - finance lease	(76,965)
Right-of-use assets - operating lease amortization	(2,014)
Consolidation of previously unconsolidated investments		31,836	39,322
Balance at end of year	$ 4,099,542	$ 3,697,805	$ 3,466,482