Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 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:

	Year Ended December 31,
	2016		2015		2014
Net income - basic	$	895,522	$	636,056	$	338,126
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	$	895,919	$	636,056	$	338,126
(Shares in thousands)
Weighted average shares - basic	104,719		103,061		100,612
Effect of dilutive securities:
Stock options	10,177		9,446		9,440
Restricted stock	474		477		425
Convertible senior notes	61		—		—
Warrants	936		2,246		2,936
Dilutive potential shares	11,648		12,169		12,801
Weighted average shares - diluted	116,367		115,230		113,413
Net income per share - basic	$	8.55	$	6.17	$	3.36
Net income per share - diluted	$	7.70	$	5.52	$	2.98

Antidilutive Securities

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

	Year Ended December 31,
(Shares in thousands)	2016	2015	2014
Stock options	8,041	1,343	1,470
Restricted stock	19	—	—
Convertible senior notes	—	994	4,247