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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested, Beginning Balance, Shares 178,000 103,000 61,000  
Granted, Shares 196,000 146,000 88,000  
Vested, Shares (64,000) (44,000) (36,000)  
Forfeited, Shares (24,000) (27,000) (10,000)  
Unvested, Ending Balance, Shares 286,000 178,000 103,000 61,000
Vested and expected to vest, Shares 286,000      
Outstanding, Weighted Average Remaining Contractual Term in Years 1 year 3 months 4 days 1 year 2 months 27 days 1 year 2 months 1 day 1 year 2 months 16 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years 1 year 3 months 4 days      
Outstanding, Aggregate Intrinsic Value $ 5,477,000 $ 3,405,000 $ 1,110,000 $ 687,000
Vested and expected to vest, Aggregate Intrinsic Value $ 5,477,000