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Investments (Details 5) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Reclassification of net realized investment (gains) losses to net income $ 2,245 [1],[2] $ 10,021 [1],[3] $ 3,341 [1],[2] $ 14,481 [1],[3]
Fixed Maturity Securities [Member]
        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning of period 238,854 411,979 146,489 423,004
Change in unrealized investment gains and losses 80,577 (182,919) 173,802 (189,828)
Reclassification of net realized investment (gains) losses to net income (1,640) (8,392) (2,500) (12,508)
End of period 317,791 220,668 317,791 220,668
Equity securities [Member]
        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning of period 5,695 3,604 4,618 720
Change in unrealized investment gains and losses 2,865 1,291 4,178 4,519
Reclassification of net realized investment (gains) losses to net income (605) (1,629) (841) (1,973)
End of period $ 7,955 $ 3,266 $ 7,955 $ 3,266
[1] All amounts are net of tax.
[2] The pretax amounts reclassified from accumulated other comprehensive income (loss), $3,455 and $5,140, are included in net realized investment gains and losses and the related tax expenses, $1,210 and $1,799, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2014, respectively.
[3] The pretax amounts reclassified from accumulated other comprehensive loss, $15,417 and $22,279, are included in net realized investment gains and the related tax expenses, $5,396 and $7,798, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2013, respectively.