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FAIR VALUE MEASUREMENTS - Summary of Changes in Level 3 for Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening balance $ 228,342 $ 260,278
Transfers into Level 3 20,832 0
Transfers out of Level 3 (27,731) (25,510)
Included in net income 3,526 (16,036)
Included in OCI 2,051 2,438
Purchases 47,982 59,250
Sales (165) (35,302)
Settlements/ distributions (35,384) (16,776)
Closing balance $ 239,453 $ 228,342
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment income, Net investment gains (losses) Net investment income, Net investment gains (losses)
FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleListNotDisclosedFlag Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment income, Net investment gains (losses) Net investment income, Net investment gains (losses)
Change in unrealized gain/(losses) $ 4,024 $ (15,591)
Fixed maturities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening balance 135,753 119,104
Transfers into Level 3 20,832 0
Transfers out of Level 3 (20,832) 0
Included in net income (1,347) (8,527)
Included in OCI 2,051 2,438
Purchases 35,744 38,173
Sales (165) (770)
Settlements/ distributions (24,813) (14,665)
Closing balance 147,223 135,753
Change in unrealized gain/(losses) 0 0
Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening balance 92,589 141,174
Transfers into Level 3 0 0
Transfers out of Level 3 (6,899) (25,510)
Included in net income 4,873 (7,509)
Included in OCI 0 0
Purchases 12,238 21,077
Sales 0 (34,532)
Settlements/ distributions (10,571) (2,111)
Closing balance 92,230 92,589
Change in unrealized gain/(losses) 4,024 (15,591)
Corporate debt | Fixed maturities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening balance 135,753 119,104
Transfers into Level 3 0 0
Transfers out of Level 3 (20,832) 0
Included in net income (1,347) (8,527)
Included in OCI 2,051 2,438
Purchases 35,744 38,173
Sales (165) (770)
Settlements/ distributions (24,813) (14,665)
Closing balance 126,391 135,753
Change in unrealized gain/(losses) 0 0
ABS | Fixed maturities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening balance 0 0
Transfers into Level 3 20,832 0
Transfers out of Level 3 0 0
Included in net income 0 0
Included in OCI 0 0
Purchases 0 0
Sales 0 0
Settlements/ distributions 0 0
Closing balance 20,832 0
Change in unrealized gain/(losses) 0 0
CLO-Equities | Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening balance 5,300 5,016
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Included in net income 849 2,395
Included in OCI 0 0
Purchases 0 0
Sales 0 0
Settlements/ distributions (6,149) (2,111)
Closing balance 0 5,300
Change in unrealized gain/(losses) 0 2,395
Other privately held investments | Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening balance 87,289 136,158
Transfers into Level 3 0 0
Transfers out of Level 3 (6,899) (25,510)
Included in net income 4,024 (9,904)
Included in OCI 0 0
Purchases 12,238 21,077
Sales 0 (34,532)
Settlements/ distributions (4,422) 0
Closing balance 92,230 87,289
Change in unrealized gain/(losses) $ 4,024 $ (17,986)