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INCOME TAX - Change in Valuation Allowance (Details) - USD ($) $ in Thousands | 7 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2016
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, beginning of period | $ (15,119) | $ (16,550) | $ (16,611) | $ (3,823)
Valuation allowance, end of period | (16,611) | (23,390) | (16,550) | (15,119)
Net operating loss carryforwards |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change | (1,504) | 1,145 | (3,793) | (4,474)
Net operating loss carryforwards | Foreign Tax Authority |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change |  | (7,979) | (6,469) |
Income tax credit carryforward | Foreign Tax Authority |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change |  |  | 7,140 | (7,140)
Income tax credit carryforward | State Tax Authority |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change |  | $ (6) | (685) |
Net unrealized capital loss |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change | $ 12 |  |  | (1,526)
Capital loss carryforward |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change |  |  |  | 1,746
Rate change |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change |  |  | $ 3,868 |
Other |  |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |  |
Valuation allowance, change |  |  |  | $ 98

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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