Shareholders' Equity/Partners' Capital (AOCI by component) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, value	$ 7,310,978
Ending balance, value	6,948,155
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, value	(40,233)
Other comprehensive (loss) income	(34,866)
Ending balance, value	(75,099)
Accumulated other comprehensive income (loss) of nonconsolidated subsidiaries
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, value	4
Other comprehensive (loss) income	(14,342)
Ending balance, value	(14,338)
Interest rate swaps
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, value	(36,126)
Other comprehensive (loss) income	(29,972)
Ending balance, value	(66,098)
Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, value	(4,111)
Other comprehensive (loss) income	9,448
Ending balance, value	$ 5,337