CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income (loss)	$ 23,201	$ 15,940	$ 61,509	$ (179,276)
Available-for-sale debt securities on which an other-than-temporary impairment has been recognized:
Subsequent unrealized gain on debt securities on which an other-than-temporary impairment has been recognized	104	1,304	1,291	2,739
Reclassification adjustment for other-than-temporary impairment on debt securities included in net income	245	0	245	117
All other unrealized gains and losses on available-for-sale securities:
All other unrealized holding gains arising during the period	(6,265)	(20,061)	43,168	(89,807)
Reclassification adjustment for other-than-temporary impairment on equity securities	0	0	0	42
Other Comprehensive Income Loss Reclassification Adjustment From AOCIF or Writedown Of Securities Before Tax			0	42
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	0	(291)	0
Income tax expense related to items of other comprehensive income	0	414	0	(8)
Other comprehensive income (loss) for the period, net of tax	(5,916)	(18,343)	44,413	(86,917)
Total comprehensive income (loss)	$ 17,285	$ (2,403)	$ 105,922	$ (266,193)