Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Investments:
Fixed maturities available-for-sale, amortized cost	$ 897,887	$ 901,209
Equity securities available-for-sale, amortized cost	20,351	13,424
Allowance for doubtful accounts	$ 1,785	$ 1,435
Shareholders' equity:
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	50,000	50,000
Common shares, shares issued	23,350	23,350
Treasury stock, shares issued	3,982	3,993