INCOME TAX	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES	10. INCOME TAX For interim income tax reporting the Company estimates its annual effective tax rate and applies this effective tax rate to its year-to-date pre-tax (loss) income. For the three months ended March 31, 2016, the effective tax rate differed from the statutory rate primarily as a result of the U.S. and Canadian valuation allowances and the impact of the statutory rate change in Alberta, Canada. For the three months ended March 31, 2017, the effective tax rate differed from the statutory rate primarily due to the U.S. and Canadian valuation allowances. As part of the San Juan Acquisition during the quarter ended March 31, 2016, the Company acquired $46.1 million in deferred tax liabilities. Changes in the acquiring company’s deferred tax assets or liabilities subsequent to a business combination are required to be recorded in income during the quarter in which the transaction occurs. Accordingly, the $46.1 million decrease in the Company’s net deferred tax assets resulted in the release of a corresponding $46.1 million valuation allowance and recognition of a tax benefit in the quarter ended March 31, 2016.

INCOME TAX

3 Months Ended

Mar. 31, 2017

10. INCOME TAX

For interim income tax reporting the Company estimates its annual effective tax rate and applies this effective tax rate to its year-to-date pre-tax (loss) income. For the three months ended March 31, 2016, the effective tax rate differed from the statutory rate primarily as a result of the U.S. and Canadian valuation allowances and the impact of the statutory rate change in Alberta, Canada. For the three months ended March 31, 2017, the effective tax rate differed from the statutory rate primarily due to the U.S. and Canadian valuation allowances.

As part of the San Juan Acquisition during the quarter ended March 31, 2016, the Company acquired $46.1 million in deferred tax liabilities. Changes in the acquiring company’s deferred tax assets or liabilities subsequent to a business combination are required to be recorded in income during the quarter in which the transaction occurs. Accordingly, the $46.1 million decrease in the Company’s net deferred tax assets resulted in the release of a corresponding $46.1 million valuation allowance and recognition of a tax benefit in the quarter ended March 31, 2016.