Earnings Per Share

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Earnings Per Share

6. Earnings Per Share

Basic earnings per share ("EPS") amounts are computed by dividing earnings by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive equivalents outstanding. To the extent stock options are anti-dilutive, they are excluded from the calculation of diluted EPS. The details of basic and diluted EPS are as follows:

	Three Months Ended				Nine Months Ended
(in thousands, except per share data)	September 30, 2011		September 30, 2010		September 30, 2011		September 30, 2010
Net income	$	45,546	$	36,130	$	133,218	$	103,992
Weighted average shares outstanding – basic		92,277		90,880		91,995		90,486
Dilutive effect of stock plans		2,168		2,332		2,273		2,558
Weighted average shares outstanding – diluted		94,445		93,212		94,268		93,044
Basic earnings per share	$	0.49	$	0.40	$	1.45	$	1.15
Diluted earnings per share	$	0.48	$	0.39	$	1.41	$	1.12
Anti-dilutive options		1,185		1,748		1,172		1,741