Reportable Segments (Reconciliation of Net Income to Net Operating Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net Operating Income	$ 127,782	$ 87,731
Net operating income from unconsolidated joint ventures	(6,035)	(7,873)
Revenues	193,898	132,733
Reimbursed expenses	(521)	(932)
General and administrative expenses	(5,652)	(11,460)
Interest expense	(15,904)	(10,820)
Depreciation and amortization	(71,614)	(45,861)
Transaction costs	(365)	(3)
Other expenses	(566)	(180)
Income from unconsolidated joint ventures	3,425	2,904
Gain on sales of investments in unconsolidated joint ventures	46,230	0
Gain on investment property transactions	90,916	13,111
Net income	175,309	36,005
Fee income
Segment Reporting Information [Line Items]
Revenues	4,732	8,728
Termination fee income
Segment Reporting Information [Line Items]
Revenues	2,844	520
Other
Segment Reporting Information [Line Items]
Revenues	$ 37	$ 140