Earnings Per Share (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
			2011		2010		2011		2010
Net income			$	58,577	$	52,770	$	57,939	$	46,659
Weighted average common shares outstanding:
	Basic			48,231		49,513		48,546		49,355
	Effect of dilutive securities:
		Stock options and employee stock purchase plan		885		932		806		814
	Diluted			49,116		50,445		49,352		50,169
	Basic earnings per share		$	1.21	$	1.07	$	1.19	$	0.95
	Diluted earnings per share		$	1.19	$	1.05	$	1.17	$	0.93