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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	NOTE H - Income Taxes The effective tax rate for the first quarter of 2018 was 23.5% compared to 30.8% in the first quarter of 2017. The difference in tax rates was primarily due to the U.S. federal income tax legislation enacted on December 22, 2017, which lowered the U.S. statutory income tax rate from 35.0% to 21.0%.