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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

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