CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 727,465	$ 547,241	$ 46,305
Other comprehensive income (loss), net of tax:
Unrealized investment gains (losses) arising during the period	(161,832)	348,510	74,297
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income	(61,551)	(116,278)	(119,548)
Unrealized investment gains (losses) arising during the period, net of reclassification adjustment	(223,383)	232,232	(45,251)
Non-credit portion of OTTI losses	0	0	(455)
Foreign currency translation adjustment	(21,414)	510	(3,045)
Net change in benefit plan assets and obligations recognized in equity and reclassification adjustment	0	1,718	92
Total other comprehensive income (loss), net of tax	(244,797)	234,460	(48,659)
Comprehensive income (loss)	$ 482,668	$ 781,701	$ (2,354)