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INCOME TAXES - Income tax expense and net tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income tax expense [Line Items]      
Total income tax expense (benefit) $ 23,692 $ (29,486) $ (7,542)
Net current tax receivables (payables) 13,130 9,683  
Net current tax receivables (payables)     (639)
Net deferred tax assets 18,621 39,775 4,438
Net tax assets 31,751 49,458 3,799
U.S.      
Income tax expense [Line Items]      
Current income tax expense (benefit) 12,601 (5,401) (6,207)
Deferred income tax expense (benefit) 17,665 15,288 18,495
Europe      
Income tax expense [Line Items]      
Current income tax expense (benefit) 22,425 10,409 10,249
Deferred income tax expense (benefit) (29,468) (49,833) (30,079)
Other      
Income tax expense [Line Items]      
Current income tax expense (benefit) $ 469 $ 51 $ 0