Summary of Investments (Unrealized Appreciation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale fixed maturities and equity securities	$ (9,598)	$ (4,401)
Equity securities	17,978	15,106
Deferred policy acquisition costs	4,871	104
Income tax effect	(4,637)	(3,784)
Total change in net unrealized investment appreciation, net of tax	$ 8,614	$ 7,025