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FAIR VALUE MEASUREMENTS - Level 3 for financial instruments measured at fair value (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Total liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | $ 6,500 | $ 10,937
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in earnings | 9,320 | 1,862
Included in OCI | 0 | 0
Purchases | 12,472 | 2,723
Sales | 0 | 0
Settlements/ Distributions | (16,782) | (9,022)
Closing Balance | 11,510 | 6,500
Change in unrealized investment gain/(loss) relating to liabilities held at the reporting date | (962) | (654)
Derivative instruments | Other liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 6,500 | 10,937
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in earnings | 9,320 | 1,862
Included in OCI | 0 | 0
Purchases | 12,472 | 2,723
Sales | 0 | 0
Settlements/ Distributions | (16,782) | (9,022)
Closing Balance | 11,510 | 6,500
Change in unrealized investment gain/(loss) relating to liabilities held at the reporting date | (962) | (654)
Fixed maturities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 96,400 | 49,440
Transfers into Level 3 | 2,324 | 5,733
Transfers out of Level 3 | (21,670) | (7,471)
Included in net income | (503) | (1,037)
Included in OCI | (39) | 187
Purchases | 17,062 | 66,679
Sales | (22,903) | (4,371)
Settlements/ Distributions | (17,774) | (12,760)
Closing Balance | 52,897 | 96,400
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 0 | 0
Fixed maturities | Corporate debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 75,875 | 38,518
Transfers into Level 3 | 2,324 | 5,733
Transfers out of Level 3 | (2,721) | (4,955)
Included in net income | (503) | (1,037)
Included in OCI | (1,524) | 1,296
Purchases | 17,062 | 48,298
Sales | (22,903) | (4,371)
Settlements/ Distributions | (14,713) | (7,607)
Closing Balance | 52,897 | 75,875
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 0 | 0
Fixed maturities | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 3,061 | 10,922
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (2,516)
Included in net income | 0 | 0
Included in OCI | 0 | (192)
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ Distributions | (3,061) | (5,153)
Closing Balance | 0 | 3,061
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 0 | 0
Fixed maturities | ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 17,464 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (18,949) | 0
Included in net income | 0 | 0
Included in OCI | 1,485 | (917)
Purchases | 0 | 18,381
Sales | 0 | 0
Settlements/ Distributions | 0 | 0
Closing Balance | 0 | 17,464
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 0 | 0
Other investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 102,842 | 27,257
Transfers into Level 3 | 0 | 36,378
Transfers out of Level 3 | 0 | 0
Included in net income | 4,142 | 16,713
Included in OCI | 0 | 0
Purchases | 2,704 | 44,405
Sales | 0 | 0
Settlements/ Distributions | (31,845) | (21,911)
Closing Balance | 77,843 | 102,842
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 4,142 | 16,713
Other investments | Other privately held investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 42,142 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 1,584 | (2,263)
Included in OCI | 0 | 0
Purchases | 2,704 | 44,405
Sales | 0 | 0
Settlements/ Distributions | 0 | 0
Closing Balance | 46,430 | 42,142
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 1,584 | (2,263)
Other investments | CLO-Equities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 60,700 | 27,257
Transfers into Level 3 | 0 | 36,378
Transfers out of Level 3 | 0 | 0
Included in net income | 2,558 | 18,976
Included in OCI | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ Distributions | (31,845) | (21,911)
Closing Balance | 31,413 | 60,700
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 2,558 | 18,976
Other assets |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 27,555 | 29,320
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 720 | 6,870
Included in OCI | 0 | 0
Purchases | 0 | 1,289
Sales | 0 | 0
Settlements/ Distributions | (3,185) | (9,924)
Closing Balance | 25,090 | 27,555
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 67 | 1,298
Other assets | Derivative instruments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 2,532 | 4,395
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 653 | 6,772
Included in OCI | 0 | 0
Purchases | 0 | 1,289
Sales | 0 | 0
Settlements/ Distributions | (3,185) | (9,924)
Closing Balance | 0 | 2,532
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 0 | 1,200
Other assets | Insurance-linked securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 25,023 | 24,925
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Included in net income | 67 | 98
Included in OCI | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Settlements/ Distributions | 0 | 0
Closing Balance | 25,090 | 25,023
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | 67 | 98
Total assets |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Opening Balance | 226,797 | 106,017
Transfers into Level 3 | 2,324 | 42,111
Transfers out of Level 3 | (21,670) | (7,471)
Included in net income | 4,359 | 22,546
Included in OCI | (39) | 187
Purchases | 19,766 | 112,373
Sales | (22,903) | (4,371)
Settlements/ Distributions | (52,804) | (44,595)
Closing Balance | 155,830 | 226,797
Change in unrealized investment gain/(loss) relating to assets held at the reporting date | $ 4,209 | $ 18,011

X
- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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