Segment Information - Reconciliation of Consolidated Net Income to Consolidated NOI (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Net income	$ 276,133	$ 4,020	$ 8,087	$ 6,820	$ 6,252	$ 4,583	$ 288,240	$ 17,655
Plus:
Interest expense	16,310			20,400			56,510	61,273
Interest expense - amortization of deferred financing costs	715			694			2,195	2,026
Depreciation and amortization	43,533			55,627			145,314	158,738
General and administrative expenses	7,069			6,974			23,973	25,217
Equity in loss of Real Estate Ventures	5,788			1,965			9,882	4,814
Less:
Interest income	467			558			1,487	1,636
Income tax (provision) benefit	(2)			0			224	(46)
Net gain on disposition of real estate	271,901			356			274,487	356
Net gain on sale of undepreciated real estate	0			250			201	1,501
Net gain on real estate venture transactions	75			2,059			75	3,594
Consolidated net operating income	$ 77,107			$ 89,257			$ 249,640	$ 262,682