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Schedule II. Condensed Financial Information Of Registrant (Balance Sheets Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 8,163,962 $ 7,434,870
Preference shares, par value (in usd per share) $ 1 $ 1
Preference shares, shares issued (in shares) 16,010,000 16,000,000
Preference shares, shares outstanding (in shares) 16,010,000 16,000,000
Common shares, par value (in usd per share) $ 1 $ 1
Common shares, shares issued (in shares) 42,207,390 40,023,789
Common shares, shares outstanding (in shares) 42,207,390 40,023,789
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 238,989 $ 104,521
Preference shares, par value (in usd per share) $ 1.00 $ 1.00
Preference shares, shares issued (in shares) 16,010,000 16,000,000
Preference shares, shares outstanding (in shares) 16,010,000 16,000,000
Common shares, par value (in usd per share) $ 1.00 $ 1.00
Common shares, shares issued (in shares) 42,207,390 40,023,789
Common shares, shares outstanding (in shares) 42,207,390 40,023,789