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Investments (Details 7) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net unrealized investment gains and losses on fixed maturity securities, net of tax      
Reclassification of net realized investment (gains) losses to net income [1],[2] $ 3,364 $ 7,584 $ 7,113
Fixed Maturity Securities [Member]      
Net unrealized investment gains and losses on fixed maturity securities, net of tax      
Beginning of period 198,714 336,604 146,489
Change in unrealized investment gains and losses 3,024 (131,202) 195,413
Reclassification of net realized investment (gains) losses to net income (3,760) (6,688) (5,298)
End of period 197,978 198,714 336,604
Equity securities [Member]      
Net unrealized investment gains and losses on fixed maturity securities, net of tax      
Beginning of period 2,649 6,988 4,618
Change in unrealized investment gains and losses 1,919 (3,443) 4,185
Reclassification of net realized investment (gains) losses to net income 395 (896) (1,815)
End of period $ 4,963 $ 2,649 $ 6,988
[1] All amounts are net of tax.
[2] The pretax amounts reclassified from accumulated other comprehensive income, $5,176, $11,667 and $10,943, are included in net realized investment gains and losses and the related tax expenses, $1,812, $4,083 and $3,830, are included in income tax expense in the Consolidated Statements of Operations for the years ended December 31, 2016, 2015 and 2014, respectively.