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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]                      
Weighted average shares outstanding used to compute basic earnings per share 32,614,000 32,605,000 32,609,000 32,482,000 32,335,000 32,319,000 32,312,000 32,242,000 32,578,116 32,302,108 32,171,751
Incremental shares attributable to stock options and restricted stock                 0 251,746 427,528
Shares used to compute diluted earnings per share 32,614,000 32,605,000 32,746,000 32,628,000 32,449,000 32,507,000 32,641,000 32,621,000 32,578,116 32,553,854 32,599,279