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Common And Common Equivalent Shares (Schedule Of Calculation Of Shares Used In The Basic And Diluted Net Income Per Share) (Details)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Common And Common Equivalent Shares [Abstract]                      
Weighted average number of common shares outstanding 48,126 [1] 47,990 [1] 47,531 [1] 47,149 [1] 46,914 [1] 46,788 [1] 46,516 [1] 46,300 [1] 47,706 46,630 45,573
Weighted average number of dilutive common share equivalents                 1,090 940 898
Weighted average number of common and common equivalent shares outstanding 49,132 [1] 48,935 [1] 48,730 [1] 48,361 [1] 47,998 [1] 47,482 [1] 47,528 [1] 47,267 [1] 48,796 47,570 46,471
Antidilutive securities not included in the dilutive earnings per share calculation                 45 464 2,348
[1] Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.