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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, 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 169,000 188,000 135,000  
Granted, Shares 104,000 126,000 144,000  
Vested, Shares (109,000) (128,000) (83,000)  
Forfeited, Shares (17,000) (17,000) (8,000)  
Unvested, Ending Balance, Shares 147,000 169,000 188,000 135,000
Vested and expected to vest, Shares 147,000      
Outstanding, Weighted Average Remaining Contractual Term in Years 8 months 19 days 8 months 16 days 9 months 7 days 8 months 27 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years 8 months 19 days      
Outstanding, Aggregate Intrinsic Value $ 4,179,000 $ 3,236,000 $ 3,603,000 $ 1,455,000
Vested and expected to vest, Aggregate Intrinsic Value $ 4,179,000