Net Income per Share (Tables)

6 Months Ended

Jun. 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 June 30,				For the Six Months Ended June 30,
	2011		2010		2011		2010
Numerator:
Net income	$	47,921	$	38,123	$	98,538	$	79,001
Add back of interest expense on 1% convertible senior notes (net of tax)	—		396		—		818
Numerator for diluted net income per common share	$	47,921	$	38,519	$	98,538	$	79,819
Denominator:
Denominator for basic net income per common share	186,612		173,317		186,731		172,209
Effect of dilutive securities:
Stock options	2,810		3,992		3,081		3,717
Effect of escrow contingencies	—		339		—		339
RSUs and deferred stock units	757		1,396		969		1,299
Assumed conversion of 1% convertible senior notes	—		11,435		—		12,182
Denominator for diluted net income per common share	190,179		190,479		190,781		189,746
Basic net income per common share	$	0.26	$	0.22	$	0.53	$	0.46
Diluted net income per common share	$	0.25	$	0.20	$	0.52	$	0.42