Consolidated Balance Sheets (Parenthetical)(USD ($)) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fixed maturity investments trading, amortized cost	$ 6,065,350	$ 6,473,429
Equity securities trading - cost	$ 647,301	$ 480,312
Common stock, shares issued	34,492,484	36,369,868
Common stock, shares outstanding	33,417,882	34,797,781
Treasury stock (shares)	1,074,602	1,572,087