Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company evaluates its deferred tax assets quarterly to determine if valuation allowances are required. In assessing the realizability of deferred tax assets, the Company considers both positive and negative evidence in determining whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company had a valuation allowance of $0.1 million against its deferred tax assets related to certain state tax jurisdictions as of March 31, 2018 and December 31, 2017. To the extent the Company generates future tax net operating losses, the Company may be required to increase the valuation allowance on deferred tax assets, which may unfavorably impact the effective tax rate. The Company has no material uncertain tax positions as of March 31, 2018 and December 31, 2017. For the three months ended March 31, 2018, the Company’s effective tax rate was 23.2%, which varied from the federal statutory rate of 21% primarily due to state income tax expense offset by excess tax windfall benefits from stock compensation. For the three months ended March 31, 2017, the effective tax rate was 20.6%, which varied from the federal statutory rate of 35% primarily due to the excess tax windfall benefit from stock compensation partially offset by state income tax expense. The 2017 Tax Act was enacted in December 2017. The 2017 Tax Act reduced the U.S. federal corporate tax rate from 35% to 21%, among other provisions. The Company has recognized a net tax benefit of $3.6 million related to the impact of the 2017 Tax Act for the remeasurement of deferred tax assets and liabilities and included this amount in its consolidated financial statements for the year ended December 31, 2017, on a provisional basis based on information currently available. The 2017 Tax Act may be subject to technical amendments, as well as interpretations and implementing regulations by the Department of Treasury and Internal Revenue Service, any of which could increase or decrease one or more impacts of the legislation. As such, the Company may record additional provisional amounts or adjustments to provisional amounts during the measurement period ending no later than December 2018. As of March 31, 2018, the Company has not adjusted the provisional estimates recognized in 2017.

Income Taxes

The Company evaluates its deferred tax assets quarterly to determine if valuation allowances are required. In assessing the realizability of deferred tax assets, the Company considers both positive and negative evidence in determining whether it is more likely than not that some portion or all of the deferred tax assets will not be realized.

The Company had a valuation allowance of $0.1 million against its deferred tax assets related to certain state tax jurisdictions as of March 31, 2018 and December 31, 2017. To the extent the Company generates future tax net operating losses, the Company may be required to increase the valuation allowance on deferred tax assets, which may unfavorably impact the effective tax rate.

The Company has no material uncertain tax positions as of March 31, 2018 and December 31, 2017.

For the three months ended March 31, 2018, the Company’s effective tax rate was 23.2%, which varied from the federal statutory rate of 21% primarily due to state income tax expense offset by excess tax windfall benefits from stock compensation. For the three months ended March 31, 2017, the effective tax rate was 20.6%, which varied from the federal statutory rate of 35% primarily due to the excess tax windfall benefit from stock compensation partially offset by state income tax expense.

The 2017 Tax Act was enacted in December 2017. The 2017 Tax Act reduced the U.S. federal corporate tax rate from 35% to 21%, among other provisions. The Company has recognized a net tax benefit of $3.6 million related to the impact of the 2017 Tax Act for the remeasurement of deferred tax assets and liabilities and included this amount in its consolidated financial statements for the year ended December 31, 2017, on a provisional basis based on information currently available. The 2017 Tax Act may be subject to technical amendments, as well as interpretations and implementing regulations by the Department of Treasury and Internal Revenue Service, any of which could increase or decrease one or more impacts of the legislation. As such, the Company may record additional provisional amounts or adjustments to provisional amounts during the measurement period ending no later than December 2018. As of March 31, 2018, the Company has not adjusted the provisional estimates recognized in 2017.