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Schedule I: Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2024 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	$ 6,947,073
Fair Value	6,484,357
Amount Reflected on the Consolidated Balance Sheet	6,484,357
U.S. government and agency securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	160,509
Fair Value	128,332
Amount Reflected on the Consolidated Balance Sheet	128,332
State and municipal obligations
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	167,114
Fair Value	148,891
Amount Reflected on the Consolidated Balance Sheet	148,891
Corporate bonds and notes
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	2,878,705
Fair Value	2,606,431
Amount Reflected on the Consolidated Balance Sheet	2,606,431
RMBS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	1,104,721
Fair Value	1,011,630
Amount Reflected on the Consolidated Balance Sheet	1,011,630
CMBS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	438,139
Fair Value	411,999
Amount Reflected on the Consolidated Balance Sheet	411,999
CLO
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	411,328
Fair Value	411,462
Amount Reflected on the Consolidated Balance Sheet	411,462
Other ABS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	442,620
Fair Value	438,871
Amount Reflected on the Consolidated Balance Sheet	438,871
Mortgage insurance-linked notes
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	45,447
Fair Value	47,156
Amount Reflected on the Consolidated Balance Sheet	47,156
Total fixed-maturities available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	5,648,583
Fair Value	5,204,772
Amount Reflected on the Consolidated Balance Sheet	5,204,772
Fixed maturities trading securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	89,479
Fair Value	82,652
Amount Reflected on the Consolidated Balance Sheet	82,652
Common stocks
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	153,470
Fair Value	146,994
Amount Reflected on the Consolidated Balance Sheet	146,994
Total equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	153,470
Fair Value	146,994
Amount Reflected on the Consolidated Balance Sheet	146,994
Residential mortgage loans held for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	525,672
Fair Value	519,885
Amount Reflected on the Consolidated Balance Sheet	519,885
Other invested assets
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	7,796
Fair Value	7,942
Amount Reflected on the Consolidated Balance Sheet	7,942
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized Cost	522,073
Fair Value	522,112
Amount Reflected on the Consolidated Balance Sheet	$ 522,112

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 15
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-7

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-7

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+ References

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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