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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale, at fair value; amortized cost | $ 2,573,272 | $ 2,586,821
Equity securities, trading, cost | 354,077 | 353,744
Other investments, portion carried at fair value | $ 29,978 | $ 31,501
Common shares, par value (USD per share) | $ 0.01 | $ 0.01
Common shares, shares authorized | 100,000,000 | 100,000,000
Common shares, shares issued | 62,805,233 | 62,660,234
Deferred tax expense (benefit) on accumulated other comprehensive income (loss) | $ 11,375 | $ 9,894
Treasury shares, number of shares | 9,408,925 | 9,408,977

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