Segment Information (Net Income to NOI Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting [Abstract]
Net income	$ 68,903	$ 76,832	$ 122,278	$ 103,825
Depreciation and amortization expense	118,662	89,777	236,105	185,131
General and administrative expense	31,902	30,602	73,118	74,788
Transaction related costs and other	2,960	106	3,965	949
Income from partially owned entities	(25,720)	(31,426)	(59,434)	(60,499)
Loss (income) from real estate fund investments	142	(5,342)	(5,532)	(5,173)
Interest and other investment income, net	(3,036)	(1,539)	(4,054)	(3,061)
Interest and debt expense	62,640	51,894	114,749	101,958
Net gains on disposition of wholly owned and partially owned assets	(28,832)	(25,724)	(35,384)	(25,724)
Income tax expense	3,564	2,841	10,975	4,825
NOI from partially owned entities	74,060	77,235	152,752	155,991
NOI attributable to noncontrolling interests in consolidated subsidiaries	(16,299)	(15,689)	(36,334)	(33,335)
NOI at share	288,946	249,567	573,204	499,675
Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net and other	(4,275)	846	(7,405)	(352)
NOI at share - cash basis	$ 284,671	$ 250,413	$ 565,799	$ 499,323