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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost $ 28,968,319
Total investments and cash, Market Value 29,673,343
Total investments and cash, Amount Shown in Balance Sheet 29,673,343
Total Fixed Maturities Available For Sale [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 22,063,592
Total investments and cash, Market Value 22,308,272
Total investments and cash, Amount Shown in Balance Sheet 22,308,272
U.S. Government and Government Agencies [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 1,407,256
Total investments and cash, Market Value 1,420,618
Total investments and cash, Amount Shown in Balance Sheet 1,420,618
State, Municipalities and Political Subdivisions [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 558,842
Total investments and cash, Market Value 586,621
Total investments and cash, Amount Shown in Balance Sheet 586,621
Foreign Government Securities [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 1,423,634
Total investments and cash, Market Value 1,437,512
Total investments and cash, Amount Shown in Balance Sheet 1,437,512
Foreign Corporate Securities [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 4,250,642
Total investments and cash, Market Value 4,278,660
Total investments and cash, Amount Shown in Balance Sheet 4,278,660
Public Utilities [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 268,021
Total investments and cash, Market Value 279,240
Total investments and cash, Amount Shown in Balance Sheet 279,240
All Other Corporate Bonds [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 10,340,207
Total investments and cash, Market Value 10,449,243
Total investments and cash, Amount Shown in Balance Sheet 10,449,243
Commercial Mortgage Backed Securities [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 1,032,506
Total investments and cash, Market Value 1,064,366
Total investments and cash, Amount Shown in Balance Sheet 1,064,366
Mortgage Backed Securities: Agency residential [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 2,361,208
Total investments and cash, Market Value 2,375,332
Total investments and cash, Amount Shown in Balance Sheet 2,375,332
Mortgage Backed Securities: Non-agency residential [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 6,530
Total investments and cash, Market Value 6,536
Total investments and cash, Amount Shown in Balance Sheet 6,536
Redeemable Preferred Stock [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 414,746
Total investments and cash, Market Value 410,144
Total investments and cash, Amount Shown in Balance Sheet 410,144
Equity Securities - at Fair Value [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 1,365,515
Total investments and cash, Market Value 1,825,908
Total investments and cash, Amount Shown in Balance Sheet 1,825,908
Short-Term Investments [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 1,178,386
Total investments and cash, Market Value 1,178,337
Total investments and cash, Amount Shown in Balance Sheet 1,178,337
Other Invested Assets [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 2,919,965
Total investments and cash, Market Value 2,919,965
Total investments and cash, Amount Shown in Balance Sheet 2,919,965
Cash [Member]  
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]  
Total investments and cash, Cost 1,440,861
Total investments and cash, Market Value 1,440,861
Total investments and cash, Amount Shown in Balance Sheet $ 1,440,861