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Investments (Details 5) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Reclassification of net realized investment (gains) losses to net income [1] $ (2,813) [2] $ (1,161) [3] $ (3,294) [2] $ (4,953) [3]
Fixed Maturity Securities [Member]        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning of period 276,381 381,244 198,714 336,604
Change in unrealized investment gains and losses 89,744 (122,709) 168,085 (77,223)
Reclassification of net realized investment (gains) losses to net income 5,331 (3,708) 4,657 (4,554)
End of period 371,456 254,827 371,456 254,827
Equity securities [Member]        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning of period 5,030 3,384 2,649 6,988
Change in unrealized investment gains and losses 4,710 (2,532) 6,898 (3,190)
Reclassification of net realized investment (gains) losses to net income (1,557) 2,547 (1,364) (399)
End of period $ 8,183 $ 3,399 $ 8,183 $ 3,399
[1] All amounts are net of tax.
[2] The pretax amounts reclassified from accumulated other comprehensive income (loss), $4,327 and $5,067, are included in net realized investment gains and losses and the related tax expenses, $1,514 and $1,773, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2016, respectively.
[3] The pretax amounts reclassified from accumulated other comprehensive income (loss), $1,786 and $7,620, are included in net realized investment gains and losses and the related tax expenses, $625 and $2,667, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2015, respectively.