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INCOME TAXES - Income tax expense and net tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income tax expense [Line Items]      
Total income tax expense (benefit) $ (12,321) $ 23,692 $ (29,486)
Net current tax receivables (payables) 12,205 13,130 9,683
Net deferred tax assets (liabilities) (1,625)    
Net deferred tax assets (liabilities)   18,621 39,775
Net tax assets 10,580 31,751 49,458
U.S.      
Income tax expense [Line Items]      
Current income tax expense (benefit) (1,122) 12,601 (5,401)
Deferred income tax expense (benefit) (3,098) 17,665 15,288
Europe      
Income tax expense [Line Items]      
Current income tax expense (benefit) 365 22,425 10,409
Deferred income tax expense (benefit) (8,466) (29,468) (49,833)
Other      
Income tax expense [Line Items]      
Current income tax expense (benefit) $ 0 $ 469 $ 51