Earnings Per Share

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

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

	Three months ended March 31,
	2014		2013
Numerators:
Numerator for both basic and diluted EPS, net income	$	68,566,071	$	45,430,567
Denominators:
Denominator for basic EPS, weighted-average shares outstanding	144,918,406		142,534,655
Potentially dilutive shares resulting from stock plans	1,800,101		540,810
Denominator for diluted EPS	146,718,507		143,075,465
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive	594,415		5,034,165