Reportable Segments (Reconciliation of Net Income to Net Operating Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Net income	$ 152,683	$ 80,765	$ 219,959
Net operating income from unconsolidated joint ventures	32,413	28,888	31,053
Fee income	(28,518)	(10,089)	(8,632)
Termination fee income	(7,228)	(1,548)	(9,270)
Other income	(246)	(1,722)	(2,248)
Reimbursed expenses	4,004	3,782	3,527
General and administrative expenses	37,007	22,040	27,523
Interest expense	53,963	39,430	33,524
Depreciation and amortization	257,149	181,382	196,745
Acquisition and transaction costs	52,881	248	1,661
Other expenses	1,109	556	1,796
Gain on extinguishment of debt	0	(8)	(2,258)
Income from unconsolidated joint ventures	(12,666)	(12,224)	(47,115)
Gain on sale of investment properties	(110,761)	(5,437)	(133,059)
Net Operating Income	$ 431,790	$ 326,063	$ 313,206