CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Change in net unrealized gains (losses) on investments, income tax	$ (673,302)	$ 392,372	$ 400,626
Reclassification adjustment for investment amounts included in net income, income tax	(15,396)	(3,317)	(14,646)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax	2,472	16,227	(13,195)
Change in accumulated (loss) gain - derivatives, income tax	395	1,108	2,382
Reclassification adjustment for derivative amounts included in net income, income tax	$ 822	$ 1,120	$ (138)