Net Income per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share Reconciliation [Abstract]

Schedule of Components Used in Diluted and Basic Income Per Common Share

The following table sets forth the components used in the computation of basic and diluted net income per common share (in thousands, except per share data):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2011		2010		2011		2010
Numerator:
Net income	$	42,285	$	39,709	$	140,823	$	118,710
Add back of interest expense on 1% convertible senior notes (net of taxes)	—		146		—		964
Numerator for diluted net income per common share	$	42,285	$	39,855	$	140,823	$	119,674
Denominator:
Denominator for basic net income per common share	183,085		181,457		185,515		175,292
Effect of dilutive securities:
Stock options	1,928		3,988		2,698		3,807
Effect of escrow contingencies	—		339		—		339
RSUs and deferred stock units	691		1,399		876		1,332
Assumed conversion of 1% convertible senior notes	—		4,088		—		9,484
Denominator for diluted net income per common share	185,704		191,271		189,089		190,254
Basic net income per common share	$	0.23	$	0.22	$	0.76	$	0.68
Diluted net income per common share	$	0.23	$	0.21	$	0.74	$	0.63