CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 73,878	$ 95,856
Other comprehensive income (loss):
Change in net unrealized gains (losses) on investments, net of income tax: (2013 - $(76,334); 2012 - $5,238)	(141,762)	9,728
Reclassification adjustment for investment amounts included in net income, net of income tax: (2013 - $(2,700); 2012 - $(379))	(5,015)	(703)
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 - $4,219; 2012 - $1,571)	7,837	2,917
Change in accumulated (loss) gain - derivatives, net of income tax: (2013 - $1,543; 2012 - $2,872)	2,866	5,333
Reclassification adjustment for derivative amounts included in net income, net of income tax: (2013 - $174; 2012 - $235)	323	438
Total other comprehensive income (loss)	(135,751)	17,713
Total comprehensive income (loss)	$ (61,873)	$ 113,569