Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ (581,847)	$ 169,183	$ 119,600
Other comprehensive (loss) income:
Net unrealized (loss) gain on available-for-sale securities	(3,951)	17,077	(7,298)
Reclassification of unrealized gain on available-for-sale securities to net income	(12,165)	(19,967)	(25,561)
Net unrealized (loss) gain on interest rate agreements	(32,806)	(16,894)	8,908
Reclassification of unrealized loss on interest rate agreements to net income	3,188	0	0
Total other comprehensive loss	(45,734)	(19,784)	(23,951)
Total Comprehensive (Loss) Income	$ (627,581)	$ 149,399	$ 95,649