CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Consolidated Balance Sheets [Abstract]
Fixed maturities, available for sale, amortized cost	$ 6,030,976	$ 5,784,205
Equity securities, available for sale, cost	$ 85,428	$ 84,754
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	63,902,509	63,629,105
Treasury stock, shares	23,254,530	23,117,554