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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Thousands	Dec. 31, 2019 USD ($)
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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Amount of investment held by insurance company, excluding investment in related party.

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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
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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
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-Name Accounting Standards Codification
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-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column C))
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