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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 13,155,035	$ 11,067,414
Preference shares, par value (in usd per share)	$ 1.00	$ 1.00
Preference shares, shares issued (in shares)	11,010,000	16,010,000
Preference shares, shares outstanding (in shares)	11,010,000	16,010,000
Common shares, par value (in usd per share)	$ 1.00	$ 1.00
Common shares, shares issued (in shares)	50,810,618	44,148,116
Common shares, shares outstanding (in shares)	50,810,618	44,148,116

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Face amount or stated value per share of common stock.

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