CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 18,942	$ (204,653)
Amounts related to available for sale securities:
Change in net unrealized gain or loss	(21,483)	(65,770)
Reclassification adjustment for amounts included in net income (loss)		66,864
Amounts related to cash flow hedges:
Change in net unrealized gain or loss	13,292	(21,251)
Reclassification adjustment for amounts included in net income (loss)	1,616	480
Other comprehensive income	(6,575)	(19,677)
Comprehensive income (loss)	$ 12,367	$ (224,330)