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Schedule I - Summary of Investments-Other Than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Investments-Other Than Investments in Related Parties
Amortized Cost	$ 5,442,797
Fair Value	4,999,566
Amount at which shown in the Balance Sheet	4,999,566
Fixed maturities
Investments-Other Than Investments in Related Parties
Amortized Cost	4,932,574
Fair Value	4,489,598
Amount at which shown in the Balance Sheet	4,489,598
Fixed maturities | United States Government and government agencies and authorities
Investments-Other Than Investments in Related Parties
Amortized Cost	1,416,257
Fair Value	1,273,844
Amount at which shown in the Balance Sheet	1,273,844
Fixed maturities | States, municipalities and political subdivisions
Investments-Other Than Investments in Related Parties
Amortized Cost	661,934
Fair Value	602,690
Amount at which shown in the Balance Sheet	602,690
Fixed maturities | Residential and commercial mortgage securities
Investments-Other Than Investments in Related Parties
Amortized Cost	577,915
Fair Value	511,824
Amount at which shown in the Balance Sheet	511,824
Fixed maturities | Asset-backed securities
Investments-Other Than Investments in Related Parties
Amortized Cost	660,345
Fair Value	624,561
Amount at which shown in the Balance Sheet	624,561
Fixed maturities | Foreign government and agency securities
Investments-Other Than Investments in Related Parties
Amortized Cost	69,651
Fair Value	62,399
Amount at which shown in the Balance Sheet	62,399
Fixed maturities | All other corporate bonds
Investments-Other Than Investments in Related Parties
Amortized Cost	1,546,472
Fair Value	1,414,280
Amount at which shown in the Balance Sheet	1,414,280
Short-term investments
Investments-Other Than Investments in Related Parties
Amortized Cost	252,282
Fair Value	252,027
Amount at which shown in the Balance Sheet	252,027
Other invested assets
Investments-Other Than Investments in Related Parties
Amortized Cost	257,941
Fair Value	257,941
Amount at which shown in the Balance Sheet	$ 257,941

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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))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611379-123010

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Cost 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
-Subparagraph (SX 210.12-15(Column B))
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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 C))
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