Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2016

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



	Three Months Ended September 30,
	2016		2015
Net income - basic	$	264,804	$	210,398
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	—		145
Net income - diluted	$	264,804	$	210,543

(Shares in thousands)
Weighted average shares - basic	104,833		103,348
Effect of dilutive securities:
Stock options	10,156		9,632
Restricted stock	479		481
Convertible senior notes	—		308
Warrants	998		2,175
Dilutive potential shares	11,633		12,596
Weighted average shares - diluted	116,466		115,944

Net income per share - basic	$	2.53	$	2.04
Net income per share - diluted	$	2.27	$	1.82



	Nine Months Ended September 30,
	2016		2015
Net income - basic	$	642,407	$	481,062
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	397		—
Net income - diluted	$	642,804	$	481,062

(Shares in thousands)
Weighted average shares - basic	104,586		102,825
Effect of dilutive securities:
Stock options	10,340		9,449
Restricted stock	474		475
Convertible senior notes	81		—
Warrants	1,086		2,395
Dilutive potential shares	11,981		12,319
Weighted average shares - diluted	116,567		115,144

Net income per share - basic	$	6.14	$	4.68
Net income per share - diluted	$	5.51	$	4.18

Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive include the following:



	Three Months Ended September 30,
(Shares in thousands)	2016	2015
Stock options	7,687	594
Restricted stock	19	—
Convertible senior notes	3	—