SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of year	$ 3,466,482	$ 3,382,000	$ 2,736,283
Other improvements	100,077	55,763	152,129
Property acquisitions	134,559	179,292	761,400
Property dispositions or held for sale assets	(34,666)	(189,895)	(134,332)
Other	(483)		(9,844)
Deconsolidation of previously consolidated investments			(123,636)
Consolidation of previously unconsolidated investments	31,836	39,322
Balance at end of year	$ 3,697,805	$ 3,466,482	$ 3,382,000