CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fixed maturities, available for sale, amortized cost	$ 6,791,301	$ 6,785,626
Equity securities, available for sale, cost	$ 96,305	$ 95,722
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	64,796,736	64,537,554
Treasury stock, shares	24,445,799	23,971,522