CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Comprehensive income (loss):
Net income (loss)	$ 162,807	$ 83,098
Other comprehensive income:
Unrealized gains (losses) on available-for-sale securities, net	(3,910)	59,408
Reclassification adjustment for net losses included in net income for other-than-temporary credit impairment losses	18,701	10,678
Reclassification adjustment for net realized losses (gains) included in net income	(5,186)	(1,612)
Other comprehensive income (loss)	9,605	68,474
Comprehensive income (loss) before preferred stock dividends	172,412	151,572
Dividends on preferred stock	5,283	0
Comprehensive income (loss) available to common stock shareholders	$ 167,129	$ 151,572