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Significant Accounting Policies (Schedule Of Weighted Average Shares Outstanding) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Significant Accounting Policies [Abstract]      
Weighted average common shares, basic 29,559 29,452 29,401
Dilutive effect of stock options     561
Weighted average common shares, diluted 29,559 29,452 29,962