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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Thousands	Dec. 31, 2020 USD ($)
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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Amount of investment held by insurance company, excluding investment in related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column B))
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column C))
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