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Income Taxes:	3 Months Ended
Income Taxes:	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes Income taxes were accrued at an estimated effective tax rate of 12% and 17% for the three months ended March 31, 2021 and 2020, respectively. The effective tax rate for the three months ended March 31, 2021 differs from the federal statutory rate of 21% principally because of the effect of the mix of U.S. and foreign incomes, state income taxes, global intangible low-taxed income ("GILTI"), foreign-derived intangible income ("FDII") and tax credits. The effective tax rate during the three months ended March 31, 2021 included a discrete tax benefit of $1.8 million related to excess tax benefits recognized on stock option exercises and the vesting of restricted stock units during the period. The effective tax rate for the three months ended March 31, 2020 differs from the federal statutory rate of 21% principally because of the effect of the mix of U.S. and foreign incomes, state income taxes, GILTI, FDII and tax credits.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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