Investments (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Reclassification of net realized investment (gains) losses to net income	$ 1,104	[1],[2]	$ 4,460	[1],[2]
Fixed Maturity Securities [Member]
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning of period	146,489		423,004
Change in unrealized investment gains and losses	93,225		(6,909)
Reclassification of net realized investment (gains) losses to net income	(860)		(4,116)
End of period	238,854		411,979
Equity securities [Member]
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning of period	4,618		720
Change in unrealized investment gains and losses	1,313		3,228
Reclassification of net realized investment (gains) losses to net income	(236)		(344)
End of period	$ 5,695		$ 3,604

[1] All amounts are net of tax.

[2] The pretax amounts reclassified from accumulated other comprehensive income, $1,699 and $6,862, are included in net realized investment gains and losses and the related tax expenses, $595 and $2,402, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2014 and 2013, respectively.