Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Amortized cost on fixed maturities trading investments	$ 2,597,393	$ 2,523,042
Cost - equity security trading investments	379,951	223,933
Cost - short-term investments	$ 229,665	$ 315,886
Common Stock
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares issued	54,979,000	54,975,000
Common stock, shares outstanding	54,979,000	54,975,000