Income Taxes	9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For interim financial reporting, we estimate the annual tax rate based on projected pre-tax income (loss) for the full year and record a quarterly income tax provision (benefit) in accordance with accounting guidance for income taxes. As the year progresses, we refine the estimate of the year's pre-tax income (loss) as new information becomes available. The continual estimation process often results in a change to the expected effective tax rate for the year. When this occurs, we adjust the income tax provision (benefit) during the quarter in which the change in estimate occurs so that the year-to-date provision reflects the expected annual tax rate. Our effective tax rate on income (loss) before income taxes was 97.4% and 13.9% for the three months ended September 30, 2017 and 2016, respectively, and 327.7% and 14.6% for the nine months ended September 30, 2017 and 2016, respectively. The higher rate is due primarily to recording valuation allowances against our net deferred tax assets. The deferred tax assets relate to net operating losses, outside basis differences in our partnership investment and other timing differences primarily associated with our U.S. operations. In determining that a valuation allowance must be recorded in the current period, we assessed the available positive and negative evidence and concluded that it is not more likely than not that sufficient future taxable income would be generated to permit the use of our deferred tax assets. This conclusion is primarily the result of cumulative losses incurred in the most recent three year period, and uncertainty regarding when we will return to profitability. The amount of deferred tax asset considered realizable and the related need for a valuation allowance may be adjusted in future periods as the available evidence changes. As of September 30, 2017, there were no significant changes to our unrecognized tax benefits as reported in our audited financial statements for the year ended December 31, 2016.

Income Taxes

For interim financial reporting, we estimate the annual tax rate based on projected pre-tax income (loss) for the full year and record a quarterly income tax provision (benefit) in accordance with accounting guidance for income taxes. As the year progresses, we refine the estimate of the year's pre-tax income (loss) as new information becomes available. The continual estimation process often results in a change to the expected effective tax rate for the year. When this occurs, we adjust the income tax provision (benefit) during the quarter in which the change in estimate occurs so that the year-to-date provision reflects the expected annual tax rate.

Our effective tax rate on income (loss) before income taxes was 97.4% and 13.9% for the three months ended September 30, 2017 and 2016, respectively, and 327.7% and 14.6% for the nine months ended September 30, 2017 and 2016, respectively. The higher rate is due primarily to recording valuation allowances against our net deferred tax assets. The deferred tax assets relate to net operating losses, outside basis differences in our partnership investment and other timing differences primarily associated with our U.S. operations.

In determining that a valuation allowance must be recorded in the current period, we assessed the available positive and negative evidence and concluded that it is not more likely than not that sufficient future taxable income would be generated to permit the use of our deferred tax assets. This conclusion is primarily the result of cumulative losses incurred in the most recent three year period, and uncertainty regarding when we will return to profitability. The amount of deferred tax asset considered realizable and the related need for a valuation allowance may be adjusted in future periods as the available evidence changes.

As of September 30, 2017, there were no significant changes to our unrecognized tax benefits as reported in our audited financial statements for the year ended December 31, 2016.