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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | $ 95,770 | $ 135,371 | $ 152,468 | $ 155,830
Transfers into Level 3 | 5,285 | 8,163 | 5,285 | 11,688
Transfers out of Level 3 | (489) | (11,212) | (33,222) | (15,490)
Included in net income | 708 | 1,232 | 15,358 | 5,279
Included in OCI | (109) | 4,906 | 1,162 | 5,921
Purchases | 15,000 | 13,871 | 27,250 | 37,282
Sales | (14,749) | (3,960) | (53,754) | (11,214)
Settlements/ distributions | (1,426) | (9,190) | (14,557) | (50,115)
Closing balance | 99,990 | 139,181 | 99,990 | 139,181
Change in unrealized investment gains/(losses) | 1,194 | 1,811 | 3,876 | 6,067
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 10,262 | 10,589 | 10,299 | 11,510
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (126) | (377) | (163) | (1,298)
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 | 10,136 | 10,212 | 10,136 | 10,212
Change in unrealized investment gains/(losses) | (126) | (377) | (163) | (1,298)
Other liabilities | Derivative instruments |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 10,262 | 10,589 | 10,299 | 11,510
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (126) | (377) | (163) | (1,298)
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 | 10,136 | 10,212 | 10,136 | 10,212
Change in unrealized investment gains/(losses) | (126) | (377) | (163) | (1,298)
Fixed maturities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 49,520 | 61,605 | 86,679 | 52,897
Transfers into Level 3 | 5,285 | 8,163 | 5,285 | 11,688
Transfers out of Level 3 | (489) | (11,212) | (33,222) | (15,490)
Included in net income | 0 | (579) | (1,459) | (698)
Included in OCI | (109) | 4,906 | 1,162 | 5,921
Purchases | 0 | 13,871 | 9,750 | 34,171
Sales | 0 | (3,960) | (5,578) | (9,714)
Settlements/ distributions | (390) | (5,266) | (8,800) | (11,247)
Closing balance | 53,817 | 67,528 | 53,817 | 67,528
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Fixed maturities | Corporate debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 39,137 | 42,553 | 49,012 | 52,897
Transfers into Level 3 | 0 | 1,346 | 0 | 2,935
Transfers out of Level 3 | (489) | 0 | (489) | (4,279)
Included in net income | 0 | (579) | (1,459) | (698)
Included in OCI | (97) | 4,962 | 836 | 5,977
Purchases | 0 | 13,871 | 0 | 17,056
Sales | 0 | (3,960) | (5,578) | (9,714)
Settlements/ distributions | 0 | (5,093) | (3,771) | (11,074)
Closing balance | 38,551 | 53,100 | 38,551 | 53,100
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Fixed maturities | Non-Agency RMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance |  | 903 |  | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (790) |  | (789)
Included in net income |  | 0 |  | 0
Included in OCI |  | (1) |  | 1
Purchases |  | 0 |  | 900
Sales |  | 0 |  | 0
Settlements/ distributions |  | (112) |  | (112)
Closing balance |  | 0 |  | 0
Change in unrealized investment gains/(losses) |  | 0 |  | 0
Fixed maturities | CMBS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 9,892 | 18,149 | 19,134 | 0
Transfers into Level 3 | 5,285 | 3,160 | 5,285 | 5,096
Transfers out of Level 3 | 0 | (10,422) | (4,767) | (10,422)
Included in net income | 0 | 0 | 0 | 0
Included in OCI | (13) | (55) | 151 | (57)
Purchases | 0 | 0 | 0 | 16,215
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (390) | (61) | (5,029) | (61)
Closing balance | 14,774 | 10,771 | 14,774 | 10,771
Change in unrealized investment gains/(losses) | 0 | 0 | 0 | 0
Fixed maturities | ABS |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 491 | 0 | 18,533 | 0
Transfers into Level 3 | 0 | 3,657 | 0 | 3,657
Transfers out of Level 3 | 0 | 0 | (27,966) | 0
Included in net income | 0 | 0 | 0 | 0
Included in OCI | 1 | 0 | 175 | 0
Purchases | 0 | 0 | 9,750 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | 0 | 0 | 0 | 0
Closing balance | 492 | 3,657 | 492 | 3,657
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 | 46,250 | 73,766 | 65,789 | 77,843
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 708 | 1,811 | 16,817 | 6,067
Included in OCI | 0 | 0 | 0 | 0
Purchases | 15,000 | 0 | 17,500 | 3,111
Sales | (14,749) | 0 | (48,176) | (1,500)
Settlements/ distributions | (1,036) | (3,924) | (5,757) | (13,868)
Closing balance | 46,173 | 71,653 | 46,173 | 71,653
Change in unrealized investment gains/(losses) | 1,194 | 1,811 | 3,876 | 6,067
Other investments | Other privately held investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 28,452 | 47,613 | 44,518 | 46,430
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | 2,016 | (224) | 16,877 | (652)
Included in OCI | 0 | 0 | 0 | 0
Purchases | 15,000 | 0 | 17,500 | 3,111
Sales | (14,749) | 0 | (48,176) | (1,500)
Settlements/ distributions | 0 | 0 | 0 | 0
Closing balance | 30,719 | 47,389 | 30,719 | 47,389
Change in unrealized investment gains/(losses) | 2,502 | (224) | 3,936 | (652)
Other investments | CLO-Equities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | 17,798 | 26,153 | 21,271 | 31,413
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Included in net income | (1,308) | 2,035 | (60) | 6,719
Included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ distributions | (1,036) | (3,924) | (5,757) | (13,868)
Closing balance | 15,454 | 24,264 | 15,454 | 24,264
Change in unrealized investment gains/(losses) | $ (1,308) | 2,035 | $ (60) | 6,719
Other assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance |  | 0 |  | 25,090
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Included in net income |  | 0 |  | (90)
Included in OCI |  | 0 |  | 0
Purchases |  | 0 |  | 0
Sales |  | 0 |  | 0
Settlements/ distributions |  | 0 |  | (25,000)
Closing balance |  | 0 |  | 0
Change in unrealized investment gains/(losses) |  | 0 |  | 0
Other assets | Insurance-linked securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance |  | 0 |  | 25,090
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Included in net income |  | 0 |  | (90)
Included in OCI |  | 0 |  | 0
Purchases |  | 0 |  | 0
Sales |  | 0 |  | 0
Settlements/ distributions |  | 0 |  | (25,000)
Closing balance |  | 0 |  | 0
Change in unrealized investment gains/(losses) |  | $ 0 |  | $ 0

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