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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Amortized cost on fixed maturities trading investments $ 2,802,441 $ 2,503,494
Cost - equity security trading investments 307,893 387,851
Cost - short-term investments $ 162,834 $ 373,180
Common Stock    
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 70,000,000 70,000,000
Common stock, shares issued (in shares) 55,164,000 55,121,000
Common stock, shares outstanding (in shares) 55,164,000 55,121,000