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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | $ 24,287,685
Total investments and cash, Market Value | 25,461,591
Total investments and cash, Amount Shown in Balance Sheet | 25,461,591
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 | 19,225,067
Total investments and cash, Market Value | 20,040,173
Total investments and cash, Amount Shown in Balance Sheet | 20,040,173
U S Treasury And Government [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 1,325,156
Total investments and cash, Market Value | 1,367,106
Total investments and cash, Amount Shown in Balance Sheet | 1,367,106
State, Municipalities and Political Subdivisions [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 543,895
Total investments and cash, Market Value | 577,295
Total investments and cash, Amount Shown in Balance Sheet | 577,295
Foreign Government Securities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 1,565,260
Total investments and cash, Market Value | 1,645,375
Total investments and cash, Amount Shown in Balance Sheet | 1,645,375
Foreign Corporate Securities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 3,297,898
Total investments and cash, Market Value | 3,472,333
Total investments and cash, Amount Shown in Balance Sheet | 3,472,333
Public Utilities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 305,922
Total investments and cash, Market Value | 329,977
Total investments and cash, Amount Shown in Balance Sheet | 329,977
All Other Corporate Bonds [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 9,051,540
Total investments and cash, Market Value | 9,377,901
Total investments and cash, Amount Shown in Balance Sheet | 9,377,901
Commercial Mortgage Backed Securities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 915,923
Total investments and cash, Market Value | 990,303
Total investments and cash, Amount Shown in Balance Sheet | 990,303
Agency Residential [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 2,206,139
Total investments and cash, Market Value | 2,267,739
Total investments and cash, Amount Shown in Balance Sheet | 2,267,739
Non-Agency Residential [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 5,187
Total investments and cash, Market Value | 5,194
Total investments and cash, Amount Shown in Balance Sheet | 5,194
Redeemable Preferred Stock [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 8,147
Total investments and cash, Market Value | 6,950
Total investments and cash, Amount Shown in Balance Sheet | 6,950
Fixed Maturities - Available For Sale At Fair Value [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost |
Total investments and cash, Market Value |
Total investments and cash, Amount Shown in Balance Sheet |
Equity Securities - at Fair Value [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 1,113,298
Total investments and cash, Market Value | 1,472,236
Total investments and cash, Amount Shown in Balance Sheet | 1,472,236
Short-Term Investments [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 1,135,088
Total investments and cash, Market Value | 1,134,950
Total investments and cash, Amount Shown in Balance Sheet | 1,134,950
Other Invested Assets [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 2,012,581
Total investments and cash, Market Value | 2,012,581
Total investments and cash, Amount Shown in Balance Sheet | 2,012,581
Cash [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 801,651
Total investments and cash, Market Value | 801,651
Total investments and cash, Amount Shown in Balance Sheet | $ 801,651

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