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Investments (Details 7) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net unrealized investment gains (losses) on fixed maturity securities, net of tax      
Reclassification of net realized investment (gains) losses to net income [1],[2] $ 7,584 $ 7,113 $ 14,459
Fixed Maturity Securities [Member]      
Net unrealized investment gains (losses) on fixed maturity securities, net of tax      
Beginning of period 336,604 146,489 423,004
Change in unrealized investment gains and losses (131,202) 195,413 (264,503)
Reclassification of net realized investment (gains) losses to net income (6,688) (5,298) (12,012)
End of period 198,714 336,604 146,489
Equity securities [Member]      
Net unrealized investment gains (losses) on fixed maturity securities, net of tax      
Beginning of period 6,988 4,618 720
Change in unrealized investment gains and losses (3,443) 4,185 6,345
Reclassification of net realized investment (gains) losses to net income (896) (1,815) (2,447)
End of period $ 2,649 $ 6,988 $ 4,618
[1] All amounts are net of tax.
[2] The pretax amounts reclassified from accumulated other comprehensive income, $11,667, $10,943 and $22,245, are included in net realized investment gains and losses and the related tax expenses, $4,083, $3,830 and $7,786, are included in income tax expense in the Consolidated Statements of Operations for the years ended December 31, 2015, 2014 and 2013, respectively.