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FAIR VALUE MEASUREMENTS (Changes in Level 3 for Financial Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | $ 78,537 | $ 66,371 | $ 91,093 | $ 59,283
Transfers into Level 3 | 19,382 | 0 | 25,566 | 9,185
Transfers out of Level 3 | (7,004) | 0 | (16,207) | 0
Included in net income | 1,413 | (2,398) | 20,462 | (3,165)
Included in OCI | 26 | 616 | (29) | 118
Purchases | 16,300 | 55 | 16,573 | 482
Sales | 0 | 0 | (26,980) | 0
Settlements/ distributions | (1,580) | (546) | (3,404) | (1,805)
Closing balance | 107,074 | 64,098 | 107,074 | 64,098
Change in unrealized investment gains/(losses) | 1,413 | (2,398) | 3,081 | (3,165)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 8,462 | 20,164 | 9,122 | 9,672
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (345) | (375) | (1,005) | 10,117
Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | (9,971) | 0 | (9,971)
Closing balance | 8,117 | 9,818 | 8,117 | 9,818
Change in unrealized investment gains/(losses) | (345) | (346) | (1,005) | 146
Other liabilities | Derivative instruments |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 8,462 | 20,164 | 9,122 | 9,672
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (345) | (375) | (1,005) | 10,117
Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | (9,971) | 0 | (9,971)
Closing balance | 8,117 | 9,818 | 8,117 | 9,818
Change in unrealized investment gains/(losses) | (345) | (346) | (1,005) | 146
Fixed maturities, available for sale |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 10,485 | 16,137 | 14,909 | 8,021
Transfers into Level 3 | 19,382 | 0 | 25,566 | 9,185
Transfers out of Level 3 | (7,004) | 0 | (16,207) | 0
Included in net income | 0 | 0 | 0 | 0
Included in OCI | 26 | 616 | (29) | 118
Purchases | 13,300 | 0 | 13,300 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (903) | (18) | (2,253) | (589)
Closing balance | 35,286 | 16,735 | 35,286 | 16,735
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 | 2,405 | 2,245 | 2,504 | 2,297
Transfers into Level 3 | 7,000 | 0 | 7,000 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 0 | 0 | 0 | 0
Included in OCI | 21 | 53 | (78) | 1
Purchases | 13,300 | 0 | 13,300 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | 0 | 0 | 0
Closing balance | 22,726 | 2,298 | 22,726 | 2,298
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 | 905 | 4,371 | 1,740 | 5,235
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 | (2) | 81 | 13 | (212)
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (903) | (18) | (1,753) | (589)
Closing balance | 0 | 4,434 | 0 | 4,434
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Fixed maturities, available for sale | Non-agency RMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance |  | 9,185 |  | 0
Transfers into Level 3 |  | 0 |  | 9,185
Transfers out of Level 3 |  | 0 |  | 0
Included in net income |  | 0 |  | 0
Included in OCI |  | 377 |  | 377
Purchases |  | 0 |  | 0
Sales |  | 0 |  | 0
Settlements/ distributions |  | 0 |  | 0
Closing balance |  | 9,562 |  | 9,562
Change in unrealized investment gains/(losses) |  | 0 |  | 0
Fixed maturities, available for sale | ABS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 7,175 | 336 | 10,665 | 489
Transfers into Level 3 | 12,382 | 0 | 18,566 | 0
Transfers out of Level 3 | (7,004) | 0 | (16,207) | 0
Included in net income | 0 | 0 | 0 | 0
Included in OCI | 7 | 105 | 36 | (48)
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | 0 | (500) | 0
Closing balance | 12,560 | 441 | 12,560 | 441
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 | 68,052 | 50,234 | 76,184 | 51,262
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 1,413 | (2,398) | 20,462 | (3,165)
Included in OCI | 0 | 0 | 0 | 0
Purchases | 3,000 | 55 | 3,273 | 482
Sales | 0 | 0 | (26,980) | 0
Settlements/ distributions | (677) | (528) | (1,151) | (1,216)
Closing balance | 71,788 | 47,363 | 71,788 | 47,363
Change in unrealized investment gains/(losses) | 1,413 | (2,398) | 3,081 | (3,165)
Other investments | CLO-Equities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 6,269 | 12,793 | 6,173 | 14,328
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 1,410 | (2,322) | 1,980 | (3,169)
Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (677) | (528) | (1,151) | (1,216)
Closing balance | 7,002 | 9,943 | 7,002 | 9,943
Change in unrealized investment gains/(losses) | 1,410 | (2,322) | 1,980 | (3,169)
Other investments | Other privately held investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 61,783 | 37,441 | 70,011 | 36,934
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 3 | (76) | 18,482 | 4
Included in OCI | 0 | 0 | 0 | 0
Purchases | 3,000 | 55 | 3,273 | 482
Sales | 0 | 0 | (26,980) | 0
Settlements/ distributions | 0 | 0 | 0 | 0
Closing balance | 64,786 | 37,420 | 64,786 | 37,420
Change in unrealized investment gains/(losses) | $ 3 | $ (76) | $ 1,101 | $ 4

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