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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | $ 20,278,211
Total investments and cash, Market Value | 20,748,500
Total investments and cash, Amount Shown in Balance Sheet | 20,748,500
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 | 16,473,491
Total investments and cash, Market Value | 16,824,944
Total investments and cash, Amount Shown in Balance Sheet | 16,824,944
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 1,489,660
Total investments and cash, Market Value | 1,515,803
Total investments and cash, Amount Shown in Balance Sheet | 1,515,803
Obligations Of U.S. States And Political Subdivisions [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 507,353
Total investments and cash, Market Value | 536,915
Total investments and cash, Amount Shown in Balance Sheet | 536,915
Foreign Government Securities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 1,492,315
Total investments and cash, Market Value | 1,505,950
Total investments and cash, Amount Shown in Balance Sheet | 1,505,950
Foreign Corporate Securities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 2,870,737
Total investments and cash, Market Value | 2,945,156
Total investments and cash, Amount Shown in Balance Sheet | 2,945,156
Public Utilities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 322,525
Total investments and cash, Market Value | 332,818
Total investments and cash, Amount Shown in Balance Sheet | 332,818
All Other Corporate Bonds [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 6,789,362
Total investments and cash, Market Value | 6,931,485
Total investments and cash, Amount Shown in Balance Sheet | 6,931,485
Commercial Mortgage Backed Securities [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 814,570
Total investments and cash, Market Value | 844,557
Total investments and cash, Amount Shown in Balance Sheet | 844,557
Agency Residential [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 2,173,099
Total investments and cash, Market Value | 2,198,581
Total investments and cash, Amount Shown in Balance Sheet | 2,198,581
Non-Agency Residential [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 5,723
Total investments and cash, Market Value | 5,703
Total investments and cash, Amount Shown in Balance Sheet | 5,703
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 | 7,976
Total investments and cash, Amount Shown in Balance Sheet | 7,976
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 | 3,966
Total investments and cash, Market Value | 5,826
Total investments and cash, Amount Shown in Balance Sheet | 5,826
Equity Securities - 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 | 814,548
Total investments and cash, Market Value | 931,457
Total investments and cash, Amount Shown in Balance Sheet | 931,457
Short-Term Investments [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 414,639
Total investments and cash, Market Value | 414,706
Total investments and cash, Amount Shown in Balance Sheet | 414,706
Other Invested Assets [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 1,763,531
Total investments and cash, Market Value | 1,763,531
Total investments and cash, Amount Shown in Balance Sheet | 1,763,531
Cash [Member] |
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items] |
Total investments and cash, Cost | 808,036
Total investments and cash, Market Value | 808,036
Total investments and cash, Amount Shown in Balance Sheet | $ 808,036

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