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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Fixed maturity investments trading, amortized cost $ 7,470,003 $ 7,434,870
Preference shares, par value (In dollars per share) $ 1 $ 1
Preference shares, shares issued (In shares) 16,000,000 16,000,000
Preference shares, shares outstanding (In shares) 16,000,000 16,000,000
Common shares, par value (In dollars per share) $ 1 $ 1
Common shares, Shares issued (In shares) 40,245,556 40,023,789
Common shares, shares outstanding (In shares) 40,245,556 40,023,789