Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

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				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Net income	$	66,533	$	64,943	$	69,973	$	68,594
Weighted average shares outstanding:
Basic	46,659		47,142		46,523		47,330
Effect of dilutive securities:
Stock options and employee stock purchase plan	1,223		1,146		1,235		1,100
Diluted	47,882		48,288		47,758		48,430
Earnings per share:
Basic	$	1.43	$	1.38	$	1.50	$	1.45
Diluted	$	1.39	$	1.34	$	1.47	$	1.42
Anti-dilutive stock options excluded from diluted earnings per share computations	—		991		1		1,174