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Earnings Per Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Abstract]        
Numerator for both basic and diluted EPS, net income $ 40,766,539 $ 38,472,169 $ 87,111,123 $ 80,805,051
Denominator for basic EPS, weighted-average shares outstanding 143,722,329 142,279,210 143,610,898 142,071,203
Potentially dilutive shares resulting from stock plans 1,019,028 1,917,784 1,243,334 1,992,412
Denominator for diluted EPS 144,741,357 144,196,994 144,854,232 144,063,615
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be antidilutive 3,513,682 1,078,512 2,906,932 307,231