CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 76,248	$ 70,911	$ 203,130	$ 248,394
Other comprehensive income (loss):
Change in net unrealized gains (losses) on investments, net of income tax: (three months: 2013 - $(145,250); 2012 - $205,778; nine months: 2013 - $(641,404); 2012 - $383,781)	(269,751)	382,163	(1,191,178)	712,739
Reclassification adjustment for investment amounts included in net income, net of income tax : (three months: 2013 - $(653); 2012 - $(4,951); nine months: 2013 - $(9,533); 2012 - $(6,423))	(1,212)	(9,198)	(17,705)	(11,931)
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: (three months 2013 - $(1,543); 2012 - $12,810; nine months: 2013 - $1,383; 2012 - $15,744)	(2,865)	23,789	2,570	29,240
Change in accumulated (loss) gain - derivatives, net of income tax: (three months: 2013 - $8; 2012 - $1,028); nine months: 2013 - $(55); 2012 - $1,424)	14	1,908	(103)	2,645
Reclassification adjustment for derivative amounts included in net income, net of income tax: (three months: 2013 - $200; 2012 - $385; nine months: 2013 - $577; 2012 - $961)	372	716	1,072	1,785
Total other comprehensive income (loss)	(273,442)	399,378	(1,205,344)	734,478
Total comprehensive income (loss)	$ (197,194)	$ 470,289	$ (1,002,214)	$ 982,872