Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Amortized cost on fixed maturities trading investments	$ 2,509,057	$ 2,523,042
Cost - equity security trading investments	444,915	223,933
Cost - short-term investments	$ 291,646	$ 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	55,021,000	54,975,000
Common stock, shares outstanding	55,021,000	54,975,000