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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fixed maturities - available for sale, at market value, amortized cost $ 15,440,999 $ 15,406,572
Short-term investments, at cost 597,107 241,010
Other invested assets, at cost $ 1,644,004 $ 1,591,745
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 69,396,000 69,202,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) $ 4,562 $ (20,697)
Treasury shares 28,626,000 28,551,000
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