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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]                      
Weighted average shares outstanding used to compute basic earnings per share 32,856,000 32,818,000 32,716,000 32,654,000 32,614,000 32,605,000 32,609,000 32,482,000 32,761,793 32,578,116 32,302,108
Incremental shares attributable to stock options and restricted stock                 13,279 0 251,746
Shares used to compute diluted earnings per share 32,900,000 32,828,000 32,716,000 32,654,000 32,614,000 32,605,000 32,746,000 32,628,000 32,775,072 32,578,116 32,553,854