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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Weighted average common shares, basic 29,376 24,466 29,369 24,460
Dilutive effect of stock options 598 496 615 451
Weighted average common shares, diluted 29,974 24,962 29,984 24,911