Net income (loss) per share (Tables)

6 Months Ended

Jun. 30, 2018

Net income (loss) per share

Schedule of calculation of net income (loss) per share

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands, except per share data)		2018	2017			2018	2017
Basic Net Income (Loss) Per Share
Basic net income (loss)	$	52,394	$	(12,484)	$	11,254	$	(199,567)
Weighted average common shares outstanding		212,210		205,141		211,945		200,200
Basic net income (loss) per share	$	0.25	$	(0.06)	$	0.05	$	(1.00)
Diluted Net Income (Loss) Per Share
Diluted net income (loss)	$	52,394	$	(12,484)	$	11,254	$	(199,567)
Weighted average common shares outstanding		212,210		205,141		211,945		200,200
Dilutive stock options and RSUs		2,893		—		3,349		—
Weighted average shares used to compute diluted net income (loss) per share		215,103		205,141		215,294		200,200
Diluted net income (loss) per share	$	0.24	$	(0.06)	$	0.05	$	(1.00)

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

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2018	2017	2018	2017
Outstanding stock options and awards	8,079,446	12,085,346	6,732,551	12,085,346
Common shares issuable upon conversion of the 2018 Notes	148,817	149,603	148,817	149,603
Common shares issuable upon conversion of the 2020 Notes	368,939	368,939	368,939	368,939
Total potential common shares excluded from diluted net loss per share computation	8,597,202	12,603,888	7,250,307	12,603,888