Shareholders' Equity/Partners' Capital (AOCI by Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	$ 6,515,238	$ 6,948,155
Ending balance, value	6,437,970	6,753,185
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	(17,534)	(75,099)
Other comprehensive income (loss)	69,310	14,346
Ending balance, value	51,776	(60,753)
Accumulated other comprehensive (loss) income of nonconsolidated subsidiaries
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	(4,063)	(14,338)
Other comprehensive income (loss)	9,205	3,591
Ending balance, value	5,142	(10,747)
Change in fair value of interest rate swaps and other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	(14,761)	(66,098)
Other comprehensive income (loss)	65,239	11,642
Ending balance, value	50,478	(54,456)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	1,290	5,337
Other comprehensive income (loss)	(5,134)	(887)
Ending balance, value	$ (3,844)	$ 4,450