Income Taxes	9 Months Ended
Sep. 30, 2018
Income Taxes [Abstract]
Income Taxes	NOTE H – Income Taxes The Tax Cuts and Jobs Act (the "Tax Act") was signed into law on December 22, 2017. The Tax Act significantly revised the U.S. corporate income tax by lowering the statutory corporate tax rate from 35% to 21%. It also eliminated certain deductions and enhanced and extended through 2026 the option to claim accelerated depreciation deductions on qualified property. Under the guidance provided in the SEC's Staff Accounting Bulletin No. 118 ("SAB 118"), we recorded provisional amounts for the impact of the Tax Act during the fourth quarter of 2017. We have completed our analysis of the provisional amounts and no adjustments are necessary for the remeasurement of the related deferred tax balance. Our tax provision for interim periods is determined using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a year to date adjustment. Our effective tax rate for the nine months ended September 30, 2018 and 2017 was 25.6% and 37.7%, respectively. The primary difference in the effective rate and the statutory rate is due to state income taxes and additional tax expenses of $0.1 million in 2018 and tax benefit of $0.2 million in 2017 from vested stock awards.

NOTE H – Income Taxes

The Tax Cuts and Jobs Act (the "Tax Act") was signed into law on December 22, 2017. The Tax Act significantly revised the U.S. corporate income tax by lowering the statutory corporate tax rate from 35% to 21%. It also eliminated certain deductions and enhanced and extended through 2026 the option to claim accelerated depreciation deductions on qualified property. Under the guidance provided in the SEC's Staff Accounting Bulletin No. 118 ("SAB 118"), we recorded provisional amounts for the impact of the Tax Act during the fourth quarter of 2017. We have completed our analysis of the provisional amounts and no adjustments are necessary for the remeasurement of the related deferred tax balance.

Our tax provision for interim periods is determined using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a year to date adjustment.

Our effective tax rate for the nine months ended September 30, 2018 and 2017 was 25.6% and 37.7%, respectively. The primary difference in the effective rate and the statutory rate is due to state income taxes and additional tax expenses of $0.1 million in 2018 and tax benefit of $0.2 million in 2017 from vested stock awards.