Net Profit per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted

The following table sets forth the computation of basic and diluted net income per share attributable to common stock (in thousands, except per share amounts):

	Years Ended December 31,
	2012		2011		2010
Numerator:
Net income	$	58,691	$	66,716	$	74,253
Denominator:
Weighted-average common shares outstanding, basic	80,529		77,988		75,825
Dilutive effect of potential common stock	2,511		2,306		2,255
Total shares, diluted	83,040		80,294		78,080
Net income per share, basic	$	0.73	$	0.86	$	0.98
Net income per share, diluted	$	0.71	$	0.83	$	0.95