CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive income (loss):
Net income (loss)	$ 106,326	$ 157,321	$ 283,233	$ 514,435
Other comprehensive income:
Unrealized gains (losses) on available-for-sale securities, net	29,980	(50,728)	115,198	(181,885)
Reclassification adjustment for net losses included in net income for other-than-temporary credit impairment losses	0	7,233	4,853	17,522
Reclassification adjustment for net realized losses (gains) included in net income	0	(220)	22,187	(4,603)
Other comprehensive income (loss)	29,980	(43,715)	142,238	(168,966)
Comprehensive income (loss) before preferred stock dividends	136,306	113,606	425,471	345,469
Dividends on preferred stock	18,438	9,960	54,267	28,760
Comprehensive income (loss) available to common stock shareholders	$ 117,868	$ 103,646	$ 371,204	$ 316,709