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FAIR VALUE MEASUREMENTS - Changes in Level 3 for Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | $ 193,608 | $ 107,074 | $ 153,325 | $ 91,093
Transfers into Level 3 | 0 | 0 | 0 | 25,566
Transfers out of Level 3 | 0 | (12,582) | 0 | (28,789)
Included in net income | 2,105 | 569 | 290 | 21,031
Included in OCI | (3,977) | (99) | (10,600) | (128)
Purchases | 30,300 | 28,436 | 84,472 | 45,010
Sales | 0 | 0 | 0 | (26,980)
Settlements/ distributions | (999) | (3,984) | (6,450) | (7,389)
Closing balance | 221,037 | 119,414 | 221,037 | 119,414
Change in unrealized investment gains/(losses) | 2,139 | 569 | 324 | 3,651
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 4,708 | 8,117 | 5,630 | 9,122
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (422) | (398) | (1,344) | (1,403)
Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | 0 | 0 | 0
Closing balance | 4,286 | 7,719 | 4,286 | 7,719
Change in unrealized investment gains/(losses) | (422) | (398) | (1,344) | (1,403)
Other liabilities | Derivative instruments |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 4,708 | 8,117 | 5,630 | 9,122
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (422) | (398) | (1,344) | (1,403)
Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | 0 | 0 | 0
Closing balance | 4,286 | 7,719 | 4,286 | 7,719
Change in unrealized investment gains/(losses) | (422) | (398) | (1,344) | (1,403)
Fixed maturities, available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 72,830 | 35,286 | 42,894 | 14,909
Transfers into Level 3 | 0 | 0 | 0 | 25,566
Transfers out of Level 3 | 0 | (12,582) | 0 | (28,789)
Included in net income | (34) | 0 | (34) | 0
Included in OCI | (3,977) | (99) | (10,600) | (128)
Purchases | 27,600 | 25,000 | 64,832 | 38,300
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (468) | 0 | (1,141) | (2,253)
Closing balance | 95,951 | 47,605 | 95,951 | 47,605
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Fixed maturities, available for sale | Corporate debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 72,830 | 22,726 | 42,894 | 2,504
Transfers into Level 3 | 0 | 0 | 0 | 7,000
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (34) | 0 | (34) | 0
Included in OCI | (3,977) | (121) | (10,600) | (199)
Purchases | 27,600 | 25,000 | 64,832 | 38,300
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (468) | 0 | (1,141) | 0
Closing balance | 95,951 | 47,605 | 95,951 | 47,605
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Fixed maturities, available for sale | CMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 0 | 0 | 0 | 1,740
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 0 | 0 | 0 | 0
Included in OCI | 0 | 0 | 0 | 13
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | 0 | 0 | (1,753)
Closing balance | 0 | 0 | 0 | 0
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Fixed maturities, available for sale | ABS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 0 | 12,560 | 0 | 10,665
Transfers into Level 3 | 0 | 0 | 0 | 18,566
Transfers out of Level 3 | 0 | (12,582) | 0 | (28,789)
Included in net income | 0 | 0 | 0 | 0
Included in OCI | 0 | 22 | 0 | 58
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | 0 | 0 | (500)
Closing balance | 0 | 0 | 0 | 0
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 120,778 | 71,788 | 110,431 | 76,184
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 2,139 | 569 | 324 | 21,031
Included in OCI | 0 | 0 | 0 | 0
Purchases | 2,700 | 3,436 | 19,640 | 6,710
Sales | 0 | 0 | 0 | (26,980)
Settlements/ distributions | (531) | (3,984) | (5,309) | (5,136)
Closing balance | 125,086 | 71,809 | 125,086 | 71,809
Change in unrealized investment gains/(losses) | 2,139 | 569 | 324 | 3,651
Other investments | CLO-Equities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 4,808 | 7,002 | 5,910 | 6,173
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 890 | 356 | 2,566 | 2,337
Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (531) | (1,061) | (3,309) | (2,213)
Closing balance | 5,167 | 6,297 | 5,167 | 6,297
Change in unrealized investment gains/(losses) | 890 | 356 | 2,566 | 2,337
Other investments | Other privately held investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 115,970 | 64,786 | 104,521 | 70,011
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 1,249 | 213 | (2,242) | 18,694
Included in OCI | 0 | 0 | 0 | 0
Purchases | 2,700 | 3,436 | 19,640 | 6,710
Sales | 0 | 0 | 0 | (26,980)
Settlements/ distributions | 0 | (2,923) | (2,000) | (2,923)
Closing balance | 119,919 | 65,512 | 119,919 | 65,512
Change in unrealized investment gains/(losses) | $ 1,249 | $ 213 | $ (2,242) | $ 1,314

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