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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Available for sale securities, amortized cost $ 3,742,234 $ 3,852,411
Allowance for expected credit losses 560 427
Trading securities, cost 46,081 45,048
Equity investments at fair value, cost 164,574 162,429
Other investments, portion carried at fair value 59,612 92,447
Premium receivable, allowance for credit loss $ 7,921 $ 7,658
Common shares, par value (in usd per share) $ 0.01 $ 0.01
Common shares, shares authorized (in shares) 100,000,000 100,000,000
Common shares, shares issued (in shares) 63,576,311 63,427,796
Deferred tax expense (benefit) on accumulated other comprehensive income (loss) $ (80,975) $ (80,810)
Treasury shares (in shares) 12,606,968 9,464,160