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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

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