Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	NOTE F – Income Taxes We record our interim provision for income taxes by applying our estimated annual effective tax rate to our year-to-date pretax income and adjust the provision for discrete tax items recorded in the period. Differences between our effective tax rate and statutory tax rates are primarily due to the impact of permanently non-deductible expenses partially offset by the federal research and development credits. Additionally, excess tax benefits generated upon settlement or exercise of stock awards are recognized as a reduction to income tax expense as a discrete tax item in the quarter that the event occurs creating potentially significant fluctuation in tax expense by quarter and by year. Our provisions for income taxes include current foreign and state income tax expense, as well as deferred tax expense. As of September 30, 2018 we do not have any unrecognized tax benefits nor any accrued interest or tax penalties. Tax Act The Tax Act, which was enacted on December 22, 2017, included broad and complex changes to the U.S tax code. The Tax Act reduced the corporate federal income tax rate to 21.0% effective January 1, 2018 and established a mandatory tax on previously untaxed foreign earnings and profits (“E&P”). The Tax Act expanded the deduction limits on executive compensation under Section 162(m) and included transition rules for previously awarded compensation. We have completed our evaluation of the impact of the Tax Act on previously untaxed foreign E&P and the deferred tax liability for withholding taxes on dividends. We have also completed our evaluation of the impact of the expanded Section 162(m) limitations and related transition rules on our deferred tax assets related to stock compensation. As a result of our evaluation, there was no material adjustment to our previously calculated discrete income tax expense relating to the Tax Act.

NOTE F – Income Taxes

We record our interim provision for income taxes by applying our estimated annual effective tax rate to our year-to-date pretax income and adjust the provision for discrete tax items recorded in the period. Differences between our effective tax rate and statutory tax rates are primarily due to the impact of permanently non-deductible expenses partially offset by the federal research and development credits. Additionally, excess tax benefits generated upon settlement or exercise of stock awards are recognized as a reduction to income tax expense as a discrete tax item in the quarter that the event occurs creating potentially significant fluctuation in tax expense by quarter and by year. Our provisions for income taxes include current foreign and state income tax expense, as well as deferred tax expense.

As of September 30, 2018 we do not have any unrecognized tax benefits nor any accrued interest or tax penalties.

Tax Act

The Tax Act, which was enacted on December 22, 2017, included broad and complex changes to the U.S tax code. The Tax Act reduced the corporate federal income tax rate to 21.0% effective January 1, 2018 and established a mandatory tax on previously untaxed foreign earnings and profits (“E&P”). The Tax Act expanded the deduction limits on executive compensation under Section 162(m) and included transition rules for previously awarded compensation.

We have completed our evaluation of the impact of the Tax Act on previously untaxed foreign E&P and the deferred tax liability for withholding taxes on dividends. We have also completed our evaluation of the impact of the expanded Section 162(m) limitations and related transition rules on our deferred tax assets related to stock compensation. As a result of our evaluation, there was no material adjustment to our previously calculated discrete income tax expense relating to the Tax Act.