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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)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary Of Significant Accounting Policies [Abstract]                      
Weighted average shares outstanding used to compute basic earnings per share 32,016,000 32,052,000 32,051,000 32,010,000 31,975,000 31,952,000 31,946,000 31,854,000 32,032,343 31,931,962 32,291,556
Incremental shares attributable to stock options and restricted stock                 160,233 281,212 280,565
Shares used to compute diluted earnings per share 32,176,000 32,101,000 32,101,000 32,393,000 32,328,000 32,060,000 32,205,000 32,262,000 32,192,576 32,213,174 32,572,121