Segment Information - Reconciliation of Consolidated Net Income to Consolidated NOI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting [Abstract]
Net income	$ 6,964	$ 8,087
Plus:
Interest expense	16,293	20,009
Interest expense - amortization of deferred financing costs	709	749
Depreciation and amortization	40,343	52,038
General and administrative expenses	6,584	8,561
Equity in loss of Real Estate Ventures	6,924	1,891
Less:
Interest and investment income	1,674	575
Income tax provision	(19)	(4)
Net gain on disposition of real estate	74	2,586
Net gain on sale of undepreciated real estate	1,993	0
Consolidated net operating income	$ 74,095	$ 88,178