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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, 2022 | Dec. 31, 2021
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | $ 16,257 | $ 28,092
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 153,325 | 91,093
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (10,200)
Included in net income | 16,153 | 45,472
Included in OCI | (9,014) | (594)
Purchases | 110,121 | 63,560
Sales | 0 | (26,980)
Settlements/ distributions | (10,307) | (9,026)
Closing balance | 260,278 | 153,325
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 5,630 | 9,122
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | (3,542) | (2,742)
Included in OCI | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ distributions | (2,088) | (750)
Closing balance | 0 | 5,630
Change in unrealized gains/(losses) | $ 0 | $ (1,769)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income, Net Investment Gain (Loss) | Net investment income, Net Investment Gain (Loss)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income, Net Investment Gain (Loss) | Net investment income, Net Investment Gain (Loss)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized gains (losses) arising during the year | Unrealized gains (losses) arising during the year
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment income, Net Investment Gain (Loss) | Net investment income, Net Investment Gain (Loss)
FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleListNotDisclosedFlag | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Fixed maturities |  |
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | $ 0 | $ 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 42,894 | 14,909
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (10,200)
Included in net income | (104) | 0
Included in OCI | (9,014) | (594)
Purchases | 90,130 | 41,800
Sales | 0 | 0
Settlements/ distributions | (4,802) | (3,021)
Closing balance | 119,104 | 42,894
Other investments |  |
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | 16,257 | 28,092
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 110,431 | 76,184
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 16,257 | 45,472
Included in OCI | 0 | 0
Purchases | 19,991 | 21,760
Sales | 0 | (26,980)
Settlements/ distributions | (5,505) | (6,005)
Closing balance | 141,174 | 110,431
Corporate debt | Fixed maturities |  |
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | 0 | 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 42,894 | 2,504
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | (104) | 0
Included in OCI | (9,014) | (642)
Purchases | 90,130 | 41,800
Sales | 0 | 0
Settlements/ distributions | (4,802) | (768)
Closing balance | 119,104 | 42,894
CMBS | Fixed maturities |  |
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | 0 | 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 0 | 1,740
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 0 | 0
Included in OCI | 0 | 13
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ distributions | 0 | (1,753)
Closing balance | 0 | 0
ABS | Fixed maturities |  |
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | 0 | 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 0 | 10,665
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (10,200)
Included in net income | 0 | 0
Included in OCI | 0 | 35
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ distributions | 0 | (500)
Closing balance | 0 | 0
CLO-Equities | Other investments |  |
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | 2,611 | 2,819
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 5,910 | 6,173
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 2,611 | 2,819
Included in OCI | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ distributions | (3,505) | (3,082)
Closing balance | 5,016 | 5,910
Other privately held investments | Other investments |  |
Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |
Change in unrealized gain/(losses) | 13,646 | 25,273
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 104,521 | 70,011
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 13,646 | 42,653
Included in OCI | 0 | 0
Purchases | 19,991 | 21,760
Sales | 0 | (26,980)
Settlements/ distributions | (2,000) | (2,923)
Closing balance | 136,158 | 104,521
Derivative instruments |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening balance | 5,630 | 9,122
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | (3,542) | (2,742)
Included in OCI | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ distributions | (2,088) | (750)
Closing balance | 0 | 5,630
Change in unrealized gains/(losses) | $ 0 | $ (1,769)

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