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INCOME TAXES - Income tax expense and net tax assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax expense [Line Items] |  |  |  |
Total income tax expense (benefit) | $ 42,000 | $ (29,486) | $ (7,542) | $ 6,340
Net current tax receivables (payables) |  | 9,683 |  | 3,540
Taxes payable | (639) |  | (639) |
Net deferred tax assets | 4,438 | 39,775 | 4,438 | 103,313
Net tax assets | $ 3,799 | 49,458 | 3,799 | 106,853
U.S. |  |  |  |
Income tax expense [Line Items] |  |  |  |
Current income tax expense (benefit) |  | (5,401) | (6,207) | 606
Deferred income tax expense (benefit) |  | 15,288 | 18,495 | (1,829)
Europe |  |  |  |
Income tax expense [Line Items] |  |  |  |
Current income tax expense (benefit) |  | 10,409 | 10,249 | 7,451
Deferred income tax expense (benefit) |  | (49,833) | (30,079) | 112
Other |  |  |  |
Income tax expense [Line Items] |  |  |  |
Current income tax expense (benefit) |  | $ 51 | $ 0 | $ 0

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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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