Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fixed maturities, available-for-sale, amortized cost	$ 2,277,384	$ 2,036,999
Equity securities, available-for-sale, cost	136,762	118,804
Short-term investments, amortized cost	$ 255,434	$ 296,250
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	17,778,131	17,709,876
Treasury stock, shares	3,511,380	3,511,380