NET LOSS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Basic and Diluted Net Loss Per Share

Given that the Company recorded a net loss for each of the periods presented, there is no difference between basic and diluted net loss per share since the effect of common stock equivalents would be anti-dilutive and are, therefore, excluded from the diluted net loss per share calculation.

	For the Year Ended December 31,
	2018			2017			2016
	(in thousands, except per share amounts)
Net loss	$	(361,918	)	$	(50,688	)	$	(267,265	)
Weighted-average number of shares of common    stock and common stock equivalents    outstanding:
Weighted-average number of shares of common    stock outstanding for computing basic loss per    share		66,250			58,818			48,697
Dilutive effect of outstanding stock    awards and stock options after application of    the treasury stock method*		—			—			—
Weighted-average number of shares of common    stock and dilutive common stock equivalents    outstanding for computing diluted loss per share		66,250			58,818			48,697
Net loss per share — basic and diluted	$	(5.46	)	$	(0.86	)	$	(5.49	)

* For the years ended December 31, 2018 and 2017, stock options, RSAs, RSUs, SARs and ESPP to purchase approximately 9.1 million and 9.4 million shares of common stock, respectively, were excluded from the net loss per share calculation as their effect would have been anti-dilutive. For the year ended December 31, 2016, stock options, RSAs and SARs to purchase approximately 5.7 million shares of common stock, were excluded from the net loss per share calculation as their effect would have been anti-dilutive. The Company accounts for the effect of the 2024 Notes on diluted net earnings per share using the if-converted method as they may be settled in cash or shares at the Company’s option. While the closing price on December 31, 2018 exceeded the conversion price of $73.42, the potential shares issuable under the 2024 Notes were excluded from the calculation of diluted loss per share as they were anti-dilutive using the if-converted method. In the period of conversion, the 2024 Notes will have no impact on diluted net earnings (loss) if they are settled in cash and will have an impact on diluted earnings per share if the Notes are settled in shares upon conversion and when the Company in an income position.