Segment Information - Reconciliation of Consolidated Net Income to Consolidated NOI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting [Abstract]
Net income	$ 4,066	$ 44,705
Plus:
Interest expense	20,357	19,533
Interest expense - amortization of deferred financing costs	666	627
Depreciation and amortization	51,980	43,291
General and administrative expenses	9,844	8,723
Equity in loss of Real Estate Ventures	1,358	825
Less:
Interest income	525	703
Income tax provision	(29)	(138)
Net gain on sale of undepreciated real estate	1,001	22
Net gain on real estate venture transactions	259	37,263
Consolidated net operating income	$ 86,515	$ 79,854