CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Fixed maturities, available-for-sale, amortized cost	$ 1,799,369	$ 1,855,598
Equity securities, available-for-sale, cost	$ 68,035	$ 64,793
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, authorized shares	1,000,000	1,000,000
Preferred stock, issued shares	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, authorized shares	50,000,000	50,000,000
Common stock, issued shares	17,400,857	17,274,440
Treasury stock, shares	2,385,393	1,532,273