CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
Change in net unrealized gains (losses) on investments, income tax	$ (420,013)	$ 172,798	$ (496,308)	$ 178,016
Reclassification adjustment for investment amounts included in net income, income tax	(6,131)	(886)	(8,835)	(1,335)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax	(1,293)	1,391	2,926	2,962
Change in accumulated (loss) gain - derivatives, income tax	(1,606)	(2,475)	(63)	397
Reclassification adjustment for derivative amounts included in net income, income tax	203	341	377	576
Change in postretirement benefits liability adjustment, income tax	$ (922)	$ (728)	$ (1,844)	$ (1,456)