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INCOME TAX - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Contingency [Line Items]        
Income tax benefit $ (12,880) $ 4 $ (25,201) $ (19,329)
Effective tax rate 15.10% 0.00% 16.70% 12.90%
CANADA        
Income Tax Contingency [Line Items]        
Income tax benefit   $ 12,700   $ 12,700