Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the United States enacted tax reform legislation commonly known as the Tax Cuts and Jobs Act (the “Tax Act”), resulting in significant modifications to U.S. tax law. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740. As of June 30, 2018, we have not made a measurement period adjustment and the accounting for the Tax Act remains incomplete. Income tax expense for the quarter and year to date ended June 30, 2018 was $3,316 and $4,571, respectively, for an effective tax rate for the quarter of 30.6 percent and for the year to date of 21.7 percent. For the quarter, the effective tax rate differs from the 21 percent federal statutory rate (as lowered by the Tax Act) on pretax income, primarily due to an increased income tax impact related to the 2017 sale of the Company's equity method investment and a net increase in state taxes. Year to date, the effective tax rate differs from the 21 percent federal statutory rate (as lowered by the Tax Act) on pretax income, primarily due to an increased income tax impact related to the 2017 sale of the Company’s equity method investment and a net increase in state taxes, partially offset by the impact of income tax benefits related to share-based compensation as accounted for in ASU 2016-09, Compensation - Stock Compensation (Topic 718) Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). Income tax expense for the quarter and year to date ended June 30, 2017 was $2,947 and $5,801, respectively, for an effective tax rate for the quarter of 31.6 percent and for the year to date of 27.8 percent. The effective tax rate differed from the 35 percent federal statutory rate on pretax income, primarily due to the impact of income tax benefits related to share-based compensation as accounted for in ASU 2016-09, which was adopted by the Company during the quarter ended September 30, 2016, the domestic production activities deduction, and state taxes, including state income tax credits in Indiana and Kansas.

Income Taxes

On December 22, 2017, the United States enacted tax reform legislation commonly known as the Tax Cuts and Jobs Act (the “Tax Act”), resulting in significant modifications to U.S. tax law. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740. As of June 30, 2018, we have not made a measurement period adjustment and the accounting for the Tax Act remains incomplete.

Income tax expense for the quarter and year to date ended June 30, 2018 was $3,316 and $4,571, respectively, for an effective tax rate for the quarter of 30.6 percent and for the year to date of 21.7 percent. For the quarter, the effective tax rate differs from the 21 percent federal statutory rate (as lowered by the Tax Act) on pretax income, primarily due to an increased income tax impact related to the 2017 sale of the Company's equity method investment and a net increase in state taxes. Year to date, the effective tax rate differs from the 21 percent federal statutory rate (as lowered by the Tax Act) on pretax income, primarily due to an increased income tax impact related to the 2017 sale of the Company’s equity method investment and a net increase in state taxes, partially offset by the impact of income tax benefits related to share-based compensation as accounted for in ASU 2016-09, Compensation - Stock Compensation (Topic 718) Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”).

Income tax expense for the quarter and year to date ended June 30, 2017 was $2,947 and $5,801, respectively, for an effective tax rate for the quarter of 31.6 percent and for the year to date of 27.8 percent. The effective tax rate differed from the 35 percent federal statutory rate on pretax income, primarily due to the impact of income tax benefits related to share-based compensation as accounted for in ASU 2016-09, which was adopted by the Company during the quarter ended September 30, 2016, the domestic production activities deduction, and state taxes, including state income tax credits in Indiana and Kansas.