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INCOME TAXES - Income tax expense and net tax assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income tax expense [Line Items] |  |  |
Total income tax expense (benefit) | $ (7,542) | $ 6,340 | $ 3,028
Net current tax receivables (payables) |  | 3,540 |
Net current tax receivables (payables) | (639) |  | (69)
Net deferred tax assets | 4,438 | 103,313 | 104,762
Net tax assets | 3,799 | 106,853 | 104,693
U.S. |  |  |
Income tax expense [Line Items] |  |  |
Current income tax expense (benefit) | (6,207) | 606 | 4,927
Deferred income tax expense (benefit) | 18,495 | (1,829) | (267)
Europe |  |  |
Income tax expense [Line Items] |  |  |
Current income tax expense (benefit) | 10,249 | 7,451 | 144
Deferred income tax expense (benefit) | (30,079) | 112 | (1,781)
Other |  |  |
Income tax expense [Line Items] |  |  |
Current income tax expense (benefit) | $ 0 | $ 0 | $ 5

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- Definition Amount of deferred tax assets, net of any valuation allowance and deferred tax liabilities, which result from applying the applicable tax rate to taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. This amount also includes the carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References No definition available. + Details
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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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