Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The Company's tax provision for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items. For the three months ended March 31, 2018, the Company recorded an income tax benefit of $15.2 million on pre-tax loss of $66.7 million for an effective tax rate of 22.8%. For the three months ended March 31, 2017, the Company recorded income tax benefit of $4.3 million on a pre-tax loss of $192.9 million, for an effective tax rate of 2.2%. The Company’s U.S. federal statutory rate is 21.0%. The most significant factor impacting the effective tax rate for the three months ended March 31, 2018 was the discrete impact of the equity compensation adjustment related to ASU No. 2016-09. The most significant factor impacting the effective tax rate for the three months ended March 31, 2017 was the discrete impact of the goodwill impairment charges.

Income Taxes

3 Months Ended

Mar. 31, 2018

12. Income Taxes

The Company's tax provision for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items.

For the three months ended March 31, 2018, the Company recorded an income tax benefit of $15.2 million on pre-tax loss of $66.7 million for an effective tax rate of 22.8%. For the three months ended March 31, 2017, the Company recorded income tax benefit of $4.3 million on a pre-tax loss of $192.9 million, for an effective tax rate of 2.2%.

The Company’s U.S. federal statutory rate is 21.0%. The most significant factor impacting the effective tax rate for the three months ended March 31, 2018 was the discrete impact of the equity compensation adjustment related to ASU No. 2016-09. The most significant factor impacting the effective tax rate for the three months ended March 31, 2017 was the discrete impact of the goodwill impairment charges.