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Earnings Per Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Numerator for both basic and diluted EPS, net income	$ 46,344,584	$ 42,332,882
Denominator for basic EPS, weighted-average shares outstanding	143,502,772	141,860,885
Potentially dilutive shares resulting from stock plans	1,485,229	2,124,959
Denominator for diluted EPS	144,988,001	143,985,844
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be antidilutive	2,233,907	0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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