Net Income per Share (Tables)

12 Months Ended

Dec. 31, 2012

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 Years Ended December 31,
	2012		2011		2010
Numerator:
Net income	$	203,989	$	200,904	$	171,220
Add back of interest expense on 1% convertible senior notes (net of tax)	—		—		1,059
Numerator for diluted net income per common share	$	203,989	$	200,904	$	172,279
Denominator:
Denominator for basic net income per common share	177,900		183,866		177,309
Effect of dilutive securities:
Stock options	2,182		2,550		3,821
Effect of escrow contingencies	—		—		254
Restricted stock units and deferred stock units	1,667		1,140		1,395
Assumed conversion of 1% convertible senior notes	—		—		7,871
Denominator for diluted net income per common share	181,749		187,556		190,650
Basic net income per common share	$	1.15	$	1.09	$	0.97
Diluted net income per common share	$	1.12	$	1.07	$	0.90

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The potentially outstanding shares excluded from the computation of diluted earnings per share are as follows (in thousands):

	For the Years Ended December 31,
	2012	2011	2010
Options	2,551	3,335	1,765
Service-based RSUs	1,154	906	267
Performance-based RSUs	1,734	2,637	3,176
Total shares excluded from computation	5,439	6,878	5,208