Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2013

The calculations of basic and diluted net income per share are as follows:



	Three Months Ended
	September 30,
	2013		2012
Net income - basic	$	141,306	$	191,468
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	4,678		7,374
Net income - diluted	$	145,984	$	198,842

(Shares in thousands)
Weighted average shares - basic	98,226		95,012
Effect of dilutive securities:
Stock options	10,379		14,106
Restricted stock	462		797
Convertible senior notes	4,761		4,761
Warrants	2,885		1,154
Dilutive potential shares	18,487		20,818
Weighted average shares - diluted	116,713		115,830

Net income per share - basic	$	1.44	$	2.02
Net income per share - diluted	$	1.25	$	1.72



	Nine Months Ended
	September 30,
	2013		2012
Net income - basic	$	327,556	$	279,862
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	13,857
Net income - diluted	$	341,413	$	279,862

(Shares in thousands)
Weighted average shares - basic	97,602		94,349
Effect of dilutive securities:
Stock options	10,220		14,080
Restricted stock	415		699
Convertible senior notes	4,761
Warrants	2,556		652
Dilutive potential shares	17,952		15,431
Weighted average shares - diluted	115,554		109,780

Net income per share - basic	$	3.36	$	2.97
Net income per share - diluted	$	2.95	$	2.55

Antidilutive Securities

Shares which have been excluded from the September 30, 2013 and 2012 diluted per share amounts because their effect would have been antidilutive, include the following:



	Nine Months Ended
	September 30,
(Shares in thousands)	2013	2012
Stock options	1,265	91
Convertible senior notes		4,761

Three Months Ended

September 30,

(Shares in thousands)

Stock options