Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	$ 5,947,855
Other comprehensive (loss) income before reclassifications	(53,571)
Amounts reclassified from accumulated other comprehensive loss	(1,669)
Ending Balance	5,763,300
Deferred net losses from terminated hedges	(200)	$ 1,300
Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	9,716
Other comprehensive (loss) income before reclassifications	(41,385)
Amounts reclassified from accumulated other comprehensive loss	(864)
Ending Balance	(32,533)
Net unrealized gain on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	1,093
Other comprehensive (loss) income before reclassifications	1,494
Amounts reclassified from accumulated other comprehensive loss	0
Ending Balance	2,587
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	15,108
Ending Balance	(40,132)
Joint venture | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	4,299
Other comprehensive (loss) income before reclassifications	(13,680)
Amounts reclassified from accumulated other comprehensive loss	(805)
Ending Balance	$ (10,186)