Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Computation of earnings per share and reconciliation of basic and diluted weighted average common shares outstanding

The table below presents the computation of earnings per share, including the reconciliation of basic and diluted weighted average shares outstanding (in thousands, except EPS):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Net income	$	21,375	$	24,169	$	89,969	$	82,108
Weighted average shares outstanding:
Basic	46,574		47,987		47,076		48,357
Effect of dilutive securities:
Stock options and employee stock purchase plan	1,213		785		1,129		800
Diluted	47,787		48,772		48,205		49,157
Earnings per share:
Basic	$	0.46	$	0.50	$	1.91	$	1.70
Diluted	$	0.45	$	0.50	$	1.87	$	1.67
Anti-dilutive stock options excluded from diluted earnings per share computations	4		1,418		964		1,418