Net loss per share (Tables)

12 Months Ended

Dec. 31, 2017

Net Income (Loss) Per Share

Schedule of calculation of net income (loss) per share

	Year Ended
	December 31,
(in thousands, except per share data)	2017		2016		2015
Basic Net Income (Loss) Per Share
Basic net income (loss)	$	(313,142)	$	104,222	$	6,531
Weighted average common shares outstanding		204,580		187,873		179,601
Basic net income (loss) per share	$	(1.53)	$	0.55	$	0.04
				0		0
Diluted Net Income (Loss) Per Share
Diluted net income (loss)	$	(313,142)	$	104,222	$	6,531
Weighted average common shares outstanding		204,580		187,873		179,601
Dilutive stock options and RSUs		—		6,252		7,701
Weighted average shares used to compute diluted net income (loss) per share		204,580		194,125		187,302
Diluted net income (loss) per share	$	(1.53)	$	0.54	$	0.03

Schedule of antidilutive securities excluded from the computation of earnings per share

The potential common shares that were excluded from the diluted net income (loss) per share computation are as follows:

	2017	2016	2015
Outstanding stock options and awards	12,585,213	2,792,424	494,468
Common shares issuable upon conversion of the 2018 Notes	149,375	7,245,149	7,245,263
Common shares issuable upon conversion of the 2020 Notes	368,939	7,241,284	7,241,361
Total potential common shares excluded from diluted net income (loss) per share computation	13,103,527	17,278,857	14,981,092