Shareholders' Equity/Partners' Capital (AOCI by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	$ 6,928,909	$ 7,496,144	$ 7,310,978	$ 5,107,883
Other comprehensive (loss) income	(7,188)	(9,293)	(49,601)	(52,712)
Amount reclassified from accumulated other comprehensive loss				(2,311)
Ending balance, value	6,885,685	7,710,256	6,885,685	7,710,256
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	(82,646)	(38,066)	(40,233)	7,664
Ending balance, value	(89,834)	(47,359)	(89,834)	(47,359)
Accumulated other comprehensive income (loss) of nonconsolidated subsidiaries
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	12	(18)	4	3,253
Other comprehensive (loss) income	(15,634)	11	(15,626)	(949)
Amount reclassified from accumulated other comprehensive loss				(2,311)
Ending balance, value	(15,622)	(7)	(15,622)	(7)
Interest rate swaps
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	(81,525)	(33,785)	(36,126)	11,759
Other comprehensive (loss) income	7,926	(9,953)	(37,473)	(55,497)
Amount reclassified from accumulated other comprehensive loss				0
Ending balance, value	(73,599)	(43,738)	(73,599)	(43,738)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, value	(1,133)	(4,263)	(4,111)	(7,348)
Other comprehensive (loss) income	520	649	3,498	3,734
Amount reclassified from accumulated other comprehensive loss				0
Ending balance, value	$ (613)	$ (3,614)	$ (613)	$ (3,614)