Reportable Segments - Reconciliation of Net Income to Net Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Net Operating Income	$ 123,124	$ 127,782
Net operating income from unconsolidated joint ventures	(4,754)	(6,035)
Total Revenues	189,550	193,898
Reimbursed expenses	(368)	(521)
General and administrative expenses	(6,733)	(5,652)
Interest expense	(17,208)	(15,904)
Depreciation and amortization	(70,870)	(71,614)
Transaction costs	0	(365)
Other expenses	(590)	(566)
Income from unconsolidated joint ventures	1,903	3,425
Gain on sales of investments in unconsolidated joint ventures	39	46,230
Gain (loss) on investment property transactions	(17)	90,916
Net income	29,311	175,309
Fee income
Segment Reporting Information [Line Items]
Total Revenues	4,529	4,732
Termination fee income
Segment Reporting Information [Line Items]
Total Revenues	42	2,844
Other
Segment Reporting Information [Line Items]
Total Revenues	$ 214	$ 37