Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2014

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,
	2014		2013		2014		2013
Numerators:
Numerator for both basic and diluted EPS, net income	$	76,726,746	$	52,097,397	$	145,292,817	$	97,527,964
Denominators:
Denominator for basic EPS, weighted-average shares outstanding	145,215,130		143,240,333		145,059,684		142,888,337
Potentially dilutive shares resulting from stock plans	1,284,363		770,292		1,558,905		649,655
Denominator for diluted EPS	146,499,493		144,010,625		146,618,589		143,537,992
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive	2,994,629		3,270,342		995,177		3,454,067