Investments (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities
Reclassification of net realized investment (gains) losses to net income	$ (915)	[1],[2]		$ 13,566	[1],[2]
Fixed Maturity Securities [Member]
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities
Beginning of period	220,668		356,104	423,004		284,338
Change in unrealized investment gains and losses	(41,288)		70,702	(231,116)		146,569
Reclassification of net realized investment (gains) losses to net income	1,193		(7,054)	(11,315)		(11,155)
End of period	180,573		419,752	180,573		419,752
Equity securities [Member]
Reconciliation of net unrealized investment gains (losses) on fixed maturity securities and equity securities
Beginning of period	3,266		543	720		2,408
Change in unrealized investment gains and losses	(679)		646	3,840		1,373
Reclassification of net realized investment (gains) losses to net income	(278)		58	(2,251)		(2,534)
End of period	$ 2,309		$ 1,247	$ 2,309		$ 1,247

[1] All amounts are net of tax.

[2] The pretax amounts reclassified from accumulated other comprehensive income, $(1,407) and $20,872, are included in net realized investment gains and losses and the related tax expenses (benefits), $(492) and $7,306, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2013, respectively.