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Per Share Information	9 Months Ended
Per Share Information	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Per Share Information Earnings per common share are computed based on the weighted average number of shares of common stock outstanding during the period and reduced for shares held in treasury. The assumed exercise of outstanding exercisable stock options and vesting of restricted stock units does not result in material dilution and is not included in the calculation.