Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 4,935,795	$ 5,517,198	$ 5,947,855	$ 4,935,795	$ 5,517,198	$ 6,589,454
Other comprehensive (loss) income before reclassifications	(57,361)	(43,495)	(2,304)
Amounts reclassified from accumulated other comprehensive loss	18,599	(98)	(1,192)
Ending Balance	4,935,795	5,517,198	5,947,855
Deferred net losses from terminated hedges				(500)	(700)
Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(57,415)	(22,780)	9,716	(57,415)	(22,780)	12,542
Other comprehensive (loss) income before reclassifications	(48,532)	(32,723)	(2,252)
Amounts reclassified from accumulated other comprehensive loss	13,897	227	(574)
Ending Balance	(57,415)	(22,780)	9,716
Net unrealized gain on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,021	2,277	1,093	1,021	2,277	1,042
Other comprehensive (loss) income before reclassifications	(1,256)	1,184	51
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending Balance	1,021	2,277	1,093
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(67,247)	(28,485)	15,108	(67,247)	(28,485)	18,604
Ending Balance	(67,247)	(28,485)	15,108
Joint venture
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	6,349,006	5,437,142		6,349,006	5,437,142
Ending Balance	6,349,006	5,437,142
Joint venture | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(10,853)	(7,982)	4,299	$ (10,853)	$ (7,982)	$ 5,020
Other comprehensive (loss) income before reclassifications	(7,573)	(11,956)	(103)
Amounts reclassified from accumulated other comprehensive loss	4,702	(325)	(618)
Ending Balance	$ (10,853)	$ (7,982)	$ 4,299