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Earnings Per Share (Schedule Of Weighted Average Shares Outstanding) (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Weighted average common shares, basic 29,363 24,455
Dilutive effect of stock options 631 401
Weighted average common shares, diluted 29,994 24,856