Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes During the three months ended March 31, 2018 and 2017, the Company recorded approximately $11.6 million and $16.2 million of income tax expense, respectively. The effective tax rate for the three months ended March 31, 2018 was 22.5% compared to a 34.1% effective tax rate for the same period in the prior year. The Company's income tax provision for the current reporting period reflects an estimated annual effective tax rate of 25.6%, calculated before the impact of discrete items. The annual estimated effective tax rate consists of a federal income tax rate of 21% and a state income tax rate, net of federal benefit, of 3.7%. The difference in the statutory rate, 24.7%, and the annual effective tax rate, 25.6%, largely consists of new limitations on the deductibility of executive compensation resulting from the new tax law’s changes to Internal Revenue Code Section 162(m). The effect of reporting discrete items in the quarter amounts to an additional decrease to the annual estimated effective tax rate of 3.1%, resulting in a total estimated effective tax rate of 22.5% for the quarter. Discrete items for the current year’s quarter included a credit to income tax expense of $1.8 million for excess tax benefits resulting from stock-based compensation awards that vested and/or were exercised during the first quarter of 2018, benefitting the current quarter’s effective tax rate. The prior year’s discrete items for the same quarter included $0.8 million of excess tax benefits resulting from stock-based compensation awards that vested and/or exercised during that period and a credit to income tax expense of $1.2 million resulting from anticipated recoveries of income taxes paid for the 2014-2015 tax years. In arriving at these rates, the Company considers a variety of factors including the forecasted full year pre-tax results, the U.S. federal tax rate of 21%, expected non-deductible expenses, and estimated state income taxes. The Company’s final effective tax rate for the full year will be dependent on the level of pre-tax income, discrete items, the apportionment of taxable income among state tax jurisdictions and the extent of non-deductible expenses in relation to pre-tax income. The Company files its tax returns as prescribed by the tax laws of the jurisdictions in which it operates. The Company’s 2014 through 2016 tax years are still subject to examination by the Internal Revenue Service and various tax years remain open to examination in certain state jurisdictions. In February 2018, the Company received notification from the Internal Revenue Service for an examination of the 2015 tax return.

9. Income Taxes

During the three months ended March 31, 2018 and 2017, the Company recorded approximately $11.6 million and $16.2 million of income tax expense, respectively. The effective tax rate for the three months ended March 31, 2018 was 22.5% compared to a 34.1% effective tax rate for the same period in the prior year.

The Company's income tax provision for the current reporting period reflects an estimated annual effective tax rate of 25.6%, calculated before the impact of discrete items. The annual estimated effective tax rate consists of a federal income tax rate of 21% and a state income tax rate, net of federal benefit, of 3.7%. The difference in the statutory rate, 24.7%, and the annual effective tax rate, 25.6%, largely consists of new limitations on the deductibility of executive compensation resulting from the new tax law’s changes to Internal Revenue Code Section 162(m). The effect of reporting discrete items in the quarter amounts to an additional decrease to the annual estimated effective tax rate of 3.1%, resulting in a total estimated effective tax rate of 22.5% for the quarter.

Discrete items for the current year’s quarter included a credit to income tax expense of $1.8 million for excess tax benefits resulting from stock-based compensation awards that vested and/or were exercised during the first quarter of 2018, benefitting the current quarter’s effective tax rate. The prior year’s discrete items for the same quarter included $0.8 million of excess tax benefits resulting from stock-based compensation awards that vested and/or exercised during that period and a credit to income tax expense of $1.2 million resulting from anticipated recoveries of income taxes paid for the 2014-2015 tax years.

In arriving at these rates, the Company considers a variety of factors including the forecasted full year pre-tax results, the U.S. federal tax rate of 21%, expected non-deductible expenses, and estimated state income taxes. The Company’s final effective tax rate for the full year will be dependent on the level of pre-tax income, discrete items, the apportionment of taxable income among state tax jurisdictions and the extent of non-deductible expenses in relation to pre-tax income.

The Company files its tax returns as prescribed by the tax laws of the jurisdictions in which it operates. The Company’s 2014 through 2016 tax years are still subject to examination by the Internal Revenue Service and various tax years remain open to examination in certain state jurisdictions. In February 2018, the Company received notification from the Internal Revenue Service for an examination of the 2015 tax return.