Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Basic and Diluted Net Income (Loss) Per Share

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

	Three Months Ended March 31,
	2016		2015
Net income - basic	$	165,736	$	76,021
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	56		—
Net income - diluted	$	165,792	$	76,021
(Shares in thousands)
Weighted average shares - basic	104,290		102,227
Effect of dilutive securities:
Stock options	8,147		9,313
Restricted stock	469		467
Convertible senior notes	44		—
Warrants	1,278		2,512
Dilutive potential shares	9,938		12,292
Weighted average shares - diluted	114,228		114,519
Net income per share - basic	$	1.59	$	0.74
Net income per share - diluted	$	1.45	$	0.66

Antidilutive Securities

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

	Three Months Ended March 31,
(Shares in thousands)	2016	2015
Stock options	7,539	3,673
Restricted stock	19	—
Convertible senior notes	—	1,929