Investments in Partially Owned Entities (Summary of Condensed Combined Financial Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets	$ 17,266,588	$ 16,221,822
Liabilities	10,062,667	8,667,400
Noncontrolling interests	688,683	606,267
Equity	6,236,346	6,533,198
Total revenues	1,589,210	1,527,951	$ 1,924,700
Net income (loss)	207,553	(461,845)	3,334,262
Net income (loss) attributable to the entities	175,999	(297,005)	3,147,937
Partially Owned Properties
Assets	12,689,000	13,344,000
Liabilities	7,553,000	7,747,000
Noncontrolling interests	2,069,000	2,075,000
Equity	3,067,000	3,522,000
Total revenues	1,184,000	1,163,000	1,504,000
Net income (loss)	190,000	45,000	39,000
Net income (loss) attributable to the entities	$ 114,000	$ (33,000)	$ (32,000)