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Summary Of Significant Accounting And Reporting Policies (Schedule Of Earnings Per Share, Basic And Diluted) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting And Reporting Policies [Abstract]      
Numerator for both basic and diluted EPS, net income $ 164,668,228 $ 137,733,969 $ 64,637,085
Denominator for basic EPS, weighted-average common shares outstanding 142,492,699 139,356,831 137,227,677
Potentially dilutive shares resulting from stock option plans 1,784,109 1,378,936 417,673
Denominator for diluted EPS 144,276,808 140,735,767 137,645,350