Earnings Per Share (Tables)

9 Months Ended

Sep. 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 September 30,				Nine months ended September 30,
	2014		2013		2014		2013
Numerators:
Numerator for both basic and diluted EPS, net income	$	72,336,883	$	55,520,961	$	217,629,700	$	153,048,925
Denominators:
Denominator for basic EPS, weighted-average shares outstanding	145,484,717		143,697,760		145,191,648		143,160,402
Potentially dilutive shares resulting from stock plans	953,259		821,140		1,176,808		655,639
Denominator for diluted EPS	146,437,976		144,518,900		146,368,456		143,816,041
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive	3,849,424		3,220,980		1,474,557		3,573,418