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Consolidated Balance Sheets (Parenthetical) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Fixed maturities - available for sale, at market value, amortized cost $ 16,493,187,000 $ 16,473,491,000
Fixed maturities - available for sale, at market value, allowance for credit loss 21,774,000 0
Short-term investments, at cost 441,707,000 414,639,000
Other invested assets, at cost $ 1,803,785,000 $ 1,763,531,000
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 shares, authorized 200,000,000 200,000,000
Common shares, outstanding 69,624,000 69,464,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) $ (5,682,000) $ 30,996,000
Treasury shares 29,636,000 28,665,000
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]    
Debt instrument, maturity date Jun. 01, 2044  
6.6 % Long Term Subordinated Notes [Member] | Subordinated Debt [Member]    
Debt instrument, maturity date May 01, 2067