CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Comprehensive income (loss):
Net income (loss)	$ 118,147	$ 239,007
Other comprehensive income:
Unrealized gains (losses) on available-for-sale securities, net	26,385	(88,816)
Reclassification adjustment for net losses included in net income for other-than-temporary credit impairment losses	4,853	1,158
Reclassification adjustment for net realized losses (gains) included in net income	14,918	0
Other comprehensive income (loss)	46,156	(87,658)
Comprehensive income (loss) before preferred stock dividends	164,303	151,349
Dividends on preferred stock	17,392	9,400
Comprehensive income (loss) available to common stock shareholders	$ 146,911	$ 141,949