Summary of Investments (Unrealized Appreciation and Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale fixed maturities and equity securities	$ 49,078	$ 8,368
Deferred policy acquisition costs	(10,854)	2,527
Income tax effect	(13,270)	(3,687)
Total change in net unrealized investment appreciation, net of tax	$ 24,954	$ 7,208