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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Comprehensive income      
Net income $ 103,866 $ 70,506 $ 80,131
Other comprehensive income (loss), net of taxes:      
Change in net unrealized gains and losses on fixed maturities and equity securities 114,178 156,954 85,200
Change in net funded status of pension and other postretirement benefit obligations 931 (3,087) (1,612)
Other comprehensive income 115,109 153,867 83,588
Total $ 218,975 $ 224,373 $ 163,719