Investments (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Reclassification of net realized investment (gains) losses to net income	$ 3,792	[1],[2]	$ 1,104	[1],[2]
Fixed Maturity Securities [Member]
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning of period	336,604		146,489
Change in unrealized investment gains and losses	45,486		93,225
Reclassification of net realized investment (gains) losses to net income	(846)		(860)
End of period	381,244		238,854
Equity securities [Member]
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning of period	6,988		4,618
Change in unrealized investment gains and losses	(658)		1,313
Reclassification of net realized investment (gains) losses to net income	(2,946)		(236)
End of period	$ 3,384		$ 5,695

[1] All amounts are net of tax.

[2] The pretax amounts reclassified from accumulated other comprehensive income (loss), $5,834 and $1,699, are included in net realized investment gains and losses and the related tax expenses, $2,042 and $595, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2015 and 2014, respectively.