CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Comprehensive income (loss):
Net income (loss)	$ (513,066)	$ 670,114	$ 88,854
Other comprehensive income:
Unrealized gains (losses) on available-for-sale securities, net	(175,709)	(115,926)	(94,136)
Reclassification adjustment for net realized losses (gains) included in net income	0	(37,116)	(56,104)
Other comprehensive income (loss)	(175,709)	(153,042)	(150,240)
Comprehensive income (loss) before preferred stock dividends	(688,775)	517,072	(61,386)
Dividends on preferred stock	73,765	73,764	73,750
Comprehensive income (loss) available to common stock shareholders	$ (762,540)	$ 443,308	$ (135,136)