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Schedule II - Condensed Financial Information Of The Registrant (Condensed Balance Sheets) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Fixed maturities - available for sale, at market value $ 20,040,173 $ 16,824,944  
Other invested assets 2,012,581 1,763,531  
Cash 801,651 808,036  
Accrued investment income 141,304 116,804  
Other assets 742,369 612,997  
TOTAL ASSETS 32,788,357 27,324,051  
Other liabilities 558,432 458,848  
Total liabilities 23,062,181 18,191,126  
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued and outstanding  
Common shares, par value 696 694  
Additional paid-in capital 2,245,301 2,219,660  
Accumulated other comprehensive income (loss), net of deferred income 534,899 28,152  
Treasury shares, at cost; (3,622,172) (3,422,152)  
Retained earnings 10,567,452 10,306,571  
Total shareholders' equity 9,726,176 9,132,925 $ 7,860,797
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 32,788,357 27,324,051  
Fixed maturities - available for sale, at market value, amortized cost 19,225,067 16,473,491  
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, at cost 29,636,000 28,665,000  
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Fixed maturities - available for sale, at market value $ 3 $ 201,666  
Other invested assets 282,762 41,700  
Cash 884 3,471  
Investment in subsidiaries, at equity in the underlying net assets 9,660,713 9,134,038  
Accrued investment income 652  
Receivable from subsidiaries 18,424 9,361  
Other assets 64,692 44,646  
TOTAL ASSETS 10,027,478 9,435,534  
Long term note payable - Affiliated 300,000 300,000  
Due to subsidiaries 1,933 1,491  
Other liabilities (631) 1,118  
Total liabilities 301,302 302,609  
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued and outstanding  
Common shares, par value 696 694  
Additional paid-in capital 2,245,301 2,219,660  
Accumulated other comprehensive income (loss), net of deferred income 534,899 28,152  
Treasury shares, at cost; (3,622,172) (3,422,152)  
Retained earnings 10,567,452 10,306,571  
Total shareholders' equity 9,726,176 9,132,925  
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 10,027,478 9,435,534  
Fixed maturities - available for sale, at market value, amortized cost 3 201,581  
Other invested assets, at cost $ 282,762 $ 41,700  
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, issued 69,620,000 69,464,000  
Common shares, outstanding 69,620,000 69,464,000  
Treasury shares, at cost 29,636,000 28,665,000  
Parent Company [Member] | Notes Payable Other Payables [Member]      
Condensed Financial Statements, Captions [Line Items]      
Date due Dec. 01, 2028