Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

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 September 30,				Nine Months Ended September 30,
			2011		2010		2011		2010
Net income			$	24,169	$	22,784	$	82,108	$	69,443
Weighted average shares outstanding:
	Basic			47,987		49,615		48,357		49,442
	Effect of dilutive securities:
		Stock options and employee stock purchase plan		785		553		800		718
	Diluted			48,772		50,168		49,157		50,160
	Earnings per share:
	Basic		$	0.50	$	0.46	$	1.70	$	1.40
	Diluted		$	0.50	$	0.45	$	1.67	$	1.38
	Anti-dilutive stock options excluded from diluted earnings per share computations (1)			1,418		2,039		1,418		1,460

(1) Since these options have exercise prices that are higher than the average market prices of our common stock, including them in the calculation would have an anti-dilutive effect on earnings per share.