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SCHEDULE I - SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Thousands	Dec. 31, 2021 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Fair value	$ 14,578,358
Amount shown on the balance sheet	15,134,317
Fixed maturities, available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	12,241,782
Fair value	12,313,200
Amount shown on the balance sheet	12,313,200
Fixed maturities, available for sale | U.S. government and agency
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	2,693,319
Fair value	2,682,448
Amount shown on the balance sheet	2,682,448
Fixed maturities, available for sale | Non-U.S. government
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	794,705
Fair value	795,178
Amount shown on the balance sheet	795,178
Fixed maturities, available for sale | Corporate debt
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	4,446,585
Fair value	4,495,312
Amount shown on the balance sheet	4,495,312
Fixed maturities, available for sale | Agency RMBS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	1,065,973
Fair value	1,074,589
Amount shown on the balance sheet	1,074,589
Fixed maturities, available for sale | CMBS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	1,223,051
Fair value	1,248,191
Amount shown on the balance sheet	1,248,191
Fixed maturities, available for sale | Non-agency RMBS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	185,854
Fair value	186,164
Amount shown on the balance sheet	186,164
Fixed maturities, available for sale | ABS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	1,628,739
Fair value	1,622,480
Amount shown on the balance sheet	1,622,480
Fixed maturities, available for sale | Municipals
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	203,556
Fair value	208,838
Amount shown on the balance sheet	208,838
Total fixed maturities, held to maturity
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	446,016
Fair value	445,033
Amount shown on the balance sheet	446,016
Total fixed maturities, held to maturity | Corporate debt
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	37,700
Fair value	37,572
Amount shown on the balance sheet	37,700
Total fixed maturities, held to maturity | ABS
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Amortized cost	408,316
Fair value	407,461
Amount shown on the balance sheet	408,316
Mortgage loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Fair value	594,088
Amount shown on the balance sheet	594,088
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Fair value	31,063
Amount shown on the balance sheet	31,063
Equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Fair value	655,675
Amount shown on the balance sheet	655,675
Other Investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Fair value	539,299
Amount shown on the balance sheet	947,982
Equity method investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Fair value	0
Amount shown on the balance sheet	$ 146,293

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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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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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-Section S99
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