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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested, Beginning Balance, Shares 135,000 257,000 236,000  
Granted, Shares 144,000 125,000 185,000  
Vested, Shares (83,000) (139,000) (143,000)  
Forfeited, Shares (8,000) (108,000) (21,000)  
Unvested, Ending Balance, Shares 188,000 135,000 257,000 236,000
Vested and expected to vest, Shares 178,000      
Outstanding, Weighted Average Remaining Contractual Term in Years 9 months 7 days 8 months 27 days 8 months 23 days 9 months 22 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years 8 months 23 days      
Outstanding, Aggregate Intrinsic Value $ 3,603,000 $ 1,455,000 $ 2,907,000 $ 2,612,000
Vested and expected to vest, Aggregate Intrinsic Value $ 3,412,000