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Income Taxes:
9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
Income Taxes
 
Income taxes were accrued at an estimated effective tax rate of 31% and 30% in the first nine months of 2014 and 2013, respectively. The effective tax rate differs from that computed at the federal statutory rate of 35% principally because of the effect of foreign and state income taxes, tax credits, deductions for domestic production activities and discrete tax items related to the conclusion of state tax examinations.