CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Fixed maturity securities, fair value	$ 594,531	$ 627,349
Fixed maturity securities, cost	201,587	144,514
Equity securities, cost	$ 13,881	$ 7,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	19,699,130	19,513,476
Common stock, shares outstanding	18,440,880	18,255,226
Treasury stock, at cost	1,258,250	1,258,250