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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale, at fair value; amortized cost | $ 2,722,063 | $ 3,055,477
Equity securities, trading, cost | 319,320 | 283,107
Other investments, portion carried at fair value | $ 30,611 | $ 28,958
Common shares, par value (USD per share) | $ 0.01 | $ 0.01
Common shares authorized (in shares) | 100,000,000 | 100,000,000
Common shares, shares issued (in shares) | 62,503,255 | 62,297,214
Deferred tax expense (benefit) on accumulated other comprehensive income (loss) | $ 12,972 | $ 31,342
Treasury shares, number of shares (in shares) | 9,402,697 | 5,763,388

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