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Earnings Per Share (Schedule Of Weighted Average Shares Outstanding) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Weighted average common shares, basic 24,466 24,432 24,460 24,445
Dilutive effect of stock options 496 116 451 171
Weighted average common shares, diluted 24,962 24,548 24,911 24,616