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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 10,324,318	$ 8,163,962
Preference shares, par value (In dollars per share)	$ 1	$ 1
Preference shares, shares issued (In shares)	16,010,000	16,010,000
Preference shares, shares outstanding (In shares)	16,010,000	16,010,000
Common shares, par value (In dollars per share)	$ 1	$ 1
Common shares, shares issued (In shares)	44,162,192	42,207,390
Common shares, shares outstanding (In shares)	44,162,192	42,207,390

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Face amount or stated value per share of common stock.

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