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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Statement of Financial Position [Abstract] |  |
Amortized cost on fixed maturities trading investments | $ 2,523,042 | $ 2,270,903
Cost - equity security trading investments | 223,933 | 475,959
Cost - short-term investments | $ 315,886 | $ 294,607
Common Stock |  |
Common stock, no par value | $ 0 | $ 0
Common stock, shares authorized | 70,000,000 | 70,000,000
Common stock, shares issued | 54,975,000 | 54,922,000
Common stock, shares outstanding | 54,975,000 | 54,922,000

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