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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested, Beginning Balance, Shares 286,000 178,000 103,000  
Granted, Shares 115,000 196,000 146,000  
Vested, Shares (99,000) (64,000) (44,000)  
Forfeited, Shares (51,000) (24,000) (27,000)  
Unvested, Ending Balance, Shares 251,000 286,000 178,000 103,000
Vested and expected to vest, Shares 251,000      
Outstanding, Weighted Average Remaining Contractual Term in Years 1 year 18 days 1 year 3 months 4 days 1 year 2 months 27 days 1 year 2 months 1 day
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years 1 year 18 days      
Outstanding, Aggregate Intrinsic Value $ 7,123,000 $ 5,477,000 $ 3,405,000 $ 1,110,000
Vested and expected to vest, Aggregate Intrinsic Value $ 7,123,000