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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fixed maturities - available for sale, at market value, amortized cost $ 19,225,067 $ 16,473,491
Fixed maturities - available for sale, at market value, allowance for credit loss (1,745)
Short-term investments, at cost 1,135,088 414,639
Other invested assets, at cost $ 2,012,581 $ 1,763,531
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 69,620,000 69,464,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) $ 80,451 $ 30,996
Treasury shares 29,636,000 28,665,000
Senior Notes [Member] | 4.868% Senior notes due 6/1/2044 [Member]    
Debt instrument, maturity date Jun. 01, 2044  
Senior Notes [Member] | 3.5% Senior notes due 10/15/2050 [Member]    
Debt instrument, maturity date Oct. 15, 2050  
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]    
Debt instrument, maturity date May 01, 2067