Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Basic And Diluted

The following table reconciles the numerators and denominators used in the calculation of basic and diluted earnings per share (EPS):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Numerators:
Numerator for both basic and diluted EPS, net income	$	86,485,242	$	74,558,437	$	166,765,236	$	151,741,878
Denominators:
Denominator for basic EPS, weighted-average shares outstanding	288,803,045		293,958,258		288,943,030		294,461,499
Potentially dilutive shares resulting from stock plans	2,660,838		3,503,844		2,429,695		3,528,533
Denominator for diluted EPS	291,463,883		297,462,102		291,372,725		297,990,032
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive	4,330,316		1,804,157		6,563,404		1,496,107