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INCOME TAX - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Contingency [Line Items]        
Income tax benefit $ (15,692) $ (14,021) $ (40,893) $ (33,350)
Effective tax rate 11.70% 18.40% 14.40% 14.70%
Canada        
Income Tax Contingency [Line Items]        
Income tax benefit       $ 12,700