CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 83,639	$ 78,291
Other comprehensive income (loss):
Change in net unrealized gains (losses) on investments, net of income tax: (2014 - $259,589; 2013 - $(76,295))	482,093	(141,691)
Reclassification adjustment for investment amounts included in net income, net of income tax: (2014 - $(2,023); 2013 - $(2,704))	(3,756)	(5,022)
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: (2014 - $2,429; 2013 - $4,219)	4,511	7,837
Change in accumulated (loss) gain - derivatives, net of income tax: (2014 - $316; 2013 - $1,543)	587	2,866
Reclassification adjustment for derivative amounts included in net income, net of income tax: (2014 - $235; 2013 - $174)	436	323
Change in postretirement benefits liability adjustment, net of income tax: (2014 - $(632); 2013 - $(922))	(1,173)	(1,712)
Total other comprehensive income (loss)	482,698	(137,399)
Total comprehensive income (loss)	$ 566,337	$ (59,108)