Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Amortized cost of investments	$ 155,976	$ 162,575
Allowance for premiums and fees receivable	$ 357	$ 364
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000	10,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000	75,000
Common stock, shares issued	40,923	40,928
Common stock, shares outstanding	40,923	40,928