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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fixed maturities - available for sale, at market value, amortized cost $ 19,932,190 $ 19,225,067
Fixed maturities - available for sale, at market value, allowance for credit loss (8,723) (1,745)
Short-term investments, at cost 826,777 1,135,088
Other invested assets, at cost $ 2,173,221 $ 2,012,581
Preferred shares, par value $ 0.01 $ 0.01
Preferred shares, authorized 50,000,000 50,000,000
Preferred shares, issued 0 0
Preferred shares, outstanding 0 0
Common shares, par value $ 0.01 $ 0.01
Common Stock, Shares Authorized 200,000,000 200,000,000
Common shares, outstanding 69,816,000 69,620,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) $ 41,161 $ 80,451
Treasury shares 29,734,000 29,636,000
Senior Notes [Member] | 4.868% Senior notes due 6/1/2044 [Member]    
Debt instrument, maturity date Jun. 01, 2044 Jun. 01, 2044
Senior Notes [Member] | 3.5% Senior notes due 10/15/2050 [Member]    
Debt instrument, maturity date Oct. 15, 2050 Oct. 15, 2050
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]    
Debt instrument, maturity date May 01, 2067 May 01, 2067