Summary of Investments (Unrealized Appreciation) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale fixed maturities	$ (105,296)	$ 29,205
Equity securities	27,352	19,873
Deferred policy acquisition costs	34,098	(10,854)
Income tax effect	15,346	(13,270)
Total change in net unrealized investment appreciation, net of tax	$ (28,500)	$ 24,954