Tax	6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]
Tax	8. Tax The effective tax rate for the three and six months ended June 30, 2017 was 15.9% and 10.6%, respectively, compared to 35.8% and 41.6% for the same periods in 2016. Market conditions continued to negatively impact our business in the second quarter of 2017. As a result of these conditions, we continue to establish valuation allowances on deferred tax assets for losses and tax credits generated in the current year, which, when applied to losses resulted in a lower effective tax rate than the U.S. statutory rate. For the three and six months ended June 30, 2016, the effect of lower tax rates on income earned in foreign jurisdictions and a reduction in tax reserves due to audit settlements, when applied to losses, resulted in a higher effective tax rate. For the three and six months ended June 30, 2016, the Company utilized the discrete-period method to compute its interim tax provision due to significant variations in the relationship between income tax expense and pre-tax accounting income or loss; consequently, the actual effective rate for the interim period was reported. For the three and six months ended June 30, 2017, the Company has returned to estimating and recording a full year effective tax rate.

8. Tax

The effective tax rate for the three and six months ended June 30, 2017 was 15.9% and 10.6%, respectively, compared to 35.8% and 41.6% for the same periods in 2016. Market conditions continued to negatively impact our business in the second quarter of 2017. As a result of these conditions, we continue to establish valuation allowances on deferred tax assets for losses and tax credits generated in the current year, which, when applied to losses resulted in a lower effective tax rate than the U.S. statutory rate. For the three and six months ended June 30, 2016, the effect of lower tax rates on income earned in foreign jurisdictions and a reduction in tax reserves due to audit settlements, when applied to losses, resulted in a higher effective tax rate.

For the three and six months ended June 30, 2016, the Company utilized the discrete-period method to compute its interim tax provision due to significant variations in the relationship between income tax expense and pre-tax accounting income or loss; consequently, the actual effective rate for the interim period was reported. For the three and six months ended June 30, 2017, the Company has returned to estimating and recording a full year effective tax rate.