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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Amortized cost on fixed maturities trading investments $ 2,897,032 $ 2,795,410
Cost - equity security trading investments 395,011 331,770
Cost - short-term investments 280,304 375,700
Fixed assets, accumulated depreciation $ 330,219 $ 319,429
Common Stock    
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 70,000 70,000
Common stock, shares issued (in shares) 55,311 55,289
Common stock, shares outstanding (in shares) 55,311 55,289