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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Thousands | Dec. 31, 2021 USD ($)
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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

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