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Investments (Details 5) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 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] $ (2,274) [2] $ (1,004) [3] $ (5,568) [2] $ (5,957) [3]
Fixed Maturity Securities [Member]        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning of period 371,456 254,827 198,714 336,604
Change in unrealized investment gains and losses 20,827 7,436 188,912 (69,787)
Reclassification of net realized investment (gains) losses to net income (11,072) (835) (6,415) (5,389)
End of period 381,211 261,428 381,211 261,428
Equity securities [Member]        
Net unrealized investment gains (losses) on fixed maturity securities, net of tax        
Beginning of period 8,183 3,399 2,649 6,988
Change in unrealized investment gains and losses (2,052) (2,584) 4,846 (5,774)
Reclassification of net realized investment (gains) losses to net income 2,211 (169) 847 (568)
End of period $ 8,342 $ 646 $ 8,342 $ 646
[1] All amounts are net of tax.
[2] The pretax amounts reclassified from accumulated other comprehensive income (loss), $3,499 and $8,566, are included in net realized investment gains and losses and the related tax expenses, $1,225 and $2,998, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2016, respectively.
[3] The pretax amounts reclassified from accumulated other comprehensive income (loss), $1,545 and $9,165, are included in net realized investment gains and losses and the related tax expenses, $541 and $3,208, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2015, respectively.