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INCOME TAXES - Income tax expense and net tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
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