Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

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,
	2018		2017		2018		2017
Numerators:
Numerator for both basic and diluted EPS, net income	$	109,023,982	$	88,535,947	$	220,272,725	$	186,092,688
Denominators:
Denominator for basic EPS, weighted-average shares outstanding	271,747,049		286,722,482		273,085,191		286,956,367
Potentially dilutive shares resulting from stock plans	2,375,449		3,120,420		2,575,227		3,581,875
Denominator for diluted EPS	274,122,498		289,842,902		275,660,418		290,538,242
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive	24,231		873,937		12,182		109,597