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Stock Compensation (Schedule Of Stock Grant Activity For PSUs) (Details) - Performance Stock Units (PSUs) [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 188,000 135,000 257,000  
Granted, Shares 126,000 144,000 125,000  
Vested, Shares (128,000) (83,000) (139,000)  
Forfeited, Shares (17,000) (8,000) (108,000)  
Unvested, Ending Balance, Shares 169,000 188,000 135,000 257,000
Vested and expected to vest, Shares 169,000      
Outstanding, Weighted Average Remaining Contractual Term in Years 8 months 16 days 9 months 7 days 8 months 27 days 8 months 23 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years 8 months 16 days      
Outstanding, Aggregate Intrinsic Value $ 3,236,000 $ 3,603,000 $ 1,455,000 $ 2,907,000
Vested and expected to vest, Aggregate Intrinsic Value $ 3,236,000