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Summary Of Significant Accounting Policies (Schedule Of Diluted Earnings Per Share Computed Using Weighted Average Common And Potentially Dilutive Common Equivalent Shares Outstanding) (Details) - shares
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]                      
Weighted average shares outstanding used to compute basic earnings per share 32,948,000 32,954,000 32,961,000 32,920,000 32,856,000 32,818,000 32,716,000 32,654,000 32,945,961 32,761,793 32,578,116
Incremental shares attributable to stock options and restricted stock                 5,327 13,279 0
Shares used to compute diluted earnings per share 32,948,000 32,954,000 33,051,000 32,957,000 32,900,000 32,818,000 32,716,000 32,654,000 32,951,288 32,775,072 32,578,116