CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 291,602	$ 308,536	$ 323,756
Other comprehensive income (loss):
Change in net unrealized gains (losses) on investments, net of income tax: (2013 - $(673,302); 2012 - $392,372; 2011 - $400,626)	(1,250,416)	728,692	744,032
Reclassification adjustment for investment amounts included in net income, net of income tax: (2013 - $(15,396); 2012 - $(3,317); 2011 - $(14,646))	(28,594)	(6,163)	(27,213)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, net of income tax: (2013 - $2,472; 2012 - $16,227; 2011 - $(13,195))	4,591	30,136	(24,506)
Change in accumulated (loss) gain - derivatives, net of income tax: (2013 - $395; 2012 - $1,108; 2011 - $2,382)	734	2,058	4,424
Reclassification adjustment for derivative amounts included in net income, net of income tax: (2013 - $822; 2012 - $1,120; 2011 - $(138))	1,527	2,080	(256)
Total other comprehensive income (loss)	(1,272,158)	756,803	696,481
Total comprehensive income (loss)	$ (980,556)	$ 1,065,339	$ 1,020,237