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Stock Compensation (Schedule Of Stock Grant Activity For RSUs) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested, Beginning Balance, Shares 226,000 251,000 286,000  
Granted, Shares 141,000 103,000 115,000  
Vested, Shares (118,000) (101,000) (99,000)  
Forfeited, Shares (37,000) (27,000) (51,000)  
Unvested, Ending Balance, Shares 212,000 226,000 251,000 286,000
Vested and expected to vest, Shares 212,000      
Outstanding, Weighted Average Remaining Contractual Term in Years 1 year 7 days 11 months 4 days 1 year 18 days 1 year 3 months 3 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years 1 year 7 days      
Outstanding, Aggregate Intrinsic Value $ 5,015,000 $ 6,131,000 $ 7,123,000 $ 5,477,000
Vested and expected to vest, Aggregate Intrinsic Value $ 5,015,000