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Summary of Significant Accounting Policies (Details 7) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of comprehensive income                              
Net income $ 31,826 $ 32,266 $ 13,103 $ 26,671 $ 32,913 $ 23,637 $ (11,851) $ 25,807 $ 14,592 $ 19,886 $ 23,381 $ 22,272 $ 103,866 $ 70,506 $ 80,131
Change in net unrealized gains and losses on fixed maturities and equity securities                              
Net unrealized holding gains and losses on fixed maturities and equity securities arising during the period                         204,460 281,202 153,743
Less: reclassification adjustment for net gains included in income before income tax                         27,298 37,663 21,576
Total, before tax expense                         177,162 243,539 132,167
Income tax expense                         62,984 86,585 46,967
Total, net of tax                         114,178 156,954 85,200
Change in net funded status of pension and other postretirement benefit obligations                              
Before tax                         1,276 (4,801) (2,464)
Income tax expense (benefit)                         345 (1,714) (852)
Total, net of tax                         931 (3,087) (1,612)
Total                         $ 218,975 $ 224,373 $ 163,719