Income Taxes	3 Months Ended
Mar. 31, 2019
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The primary difference in the effective income tax rate between the first quarter of 2019 and 2018 results from changes in the geographic mix of income. The difference between our overall tax rate and the U.S. statutory rate of 21 percent principally relates to state and local income taxes, net of federal income tax benefits, and the differences between tax rates in the various foreign jurisdictions in which we operate. In addition, the Company's first quarter results include a discrete income tax expense of approximately $0.2 million and an income tax benefit of approximately $0.4 million, in 2019 and 2018, respectively, related to employee share-based payment accounting. The U.S. corporate statutory tax rate was reduced to 21 percent as the result of tax legislation enacted in December 2017 commonly referred to as the Tax Cuts and Jobs Act ("TCJA"). The Company recorded the final adjustments to the provisional impact of the TCJA in the fourth quarter of 2018.

Income Taxes

3 Months Ended

Mar. 31, 2019

Income Taxes

The primary difference in the effective income tax rate between the first quarter of 2019 and 2018 results from changes in the geographic mix of income. The difference between our overall tax rate and the U.S. statutory rate of 21 percent principally relates to state and local income taxes, net of federal income tax benefits, and the differences between tax rates in the various foreign jurisdictions in which we operate. In addition, the Company's first quarter results include a discrete income tax expense of approximately $0.2 million and an income tax benefit of approximately $0.4 million, in 2019 and 2018, respectively, related to employee share-based payment accounting.

The U.S. corporate statutory tax rate was reduced to 21 percent as the result of tax legislation enacted in December 2017 commonly referred to as the Tax Cuts and Jobs Act ("TCJA"). The Company recorded the final adjustments to the provisional impact of the TCJA in the fourth quarter of 2018.