Segment Information - Reconciliation of Consolidated Net Income to Consolidated NOI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting [Abstract]
Net income	$ 8,087	$ 4,583
Plus:
Interest expense	20,009	20,357
Interest expense - amortization of deferred financing costs	749	666
Depreciation and amortization	52,038	51,444
General and administrative expenses	8,561	9,844
Equity in loss of Real Estate Ventures	1,891	1,358
Less:
Interest income	575	525
Income tax provision	(4)	(29)
Net gain on disposition of real estate	2,586	0
Net gain on sale of undepreciated real estate	0	1,001
Net gain on real estate venture transactions	0	259
Consolidated net operating income	$ 88,178	$ 86,496