Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table reconciles net income (loss) and the weighted-average shares used in computing basic and diluted earnings per share in the respective periods (in thousands):

	Twelve months ended December 31,
	2018		2017			2016
Numerator:
Net income (loss) used for basic earnings per share	$	74,183	$	(8,165	)	$	(13,808	)
Interest expense on Convertible Senior Notes, net of tax	4,927		—			—
Net income (loss) used for diluted earnings per share, if-converted method	$	79,110	$	(8,165	)	$	(13,808	)
Basic weighted-average common shares outstanding	37,995		33,734			32,708
Potentially dilutive shares issuable from Convertible Senior Notes, if-converted	2,850		—			—
Potentially dilutive shares issuable from stock options and unvested RSUs	1,709		—			—
Diluted weighted-average common shares outstanding, if-converted	42,554		33,734			32,708
Potentially dilutive shares excluded from calculation due to anti-dilutive effect	161		37			2,770

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table reconciles net income (loss) and the weighted-average shares used in computing basic and diluted earnings per share in the respective periods (in thousands):

	Twelve months ended December 31,
	2018		2017			2016
Numerator:
Net income (loss) used for basic earnings per share	$	74,183	$	(8,165	)	$	(13,808	)
Interest expense on Convertible Senior Notes, net of tax	4,927		—			—
Net income (loss) used for diluted earnings per share, if-converted method	$	79,110	$	(8,165	)	$	(13,808	)
Basic weighted-average common shares outstanding	37,995		33,734			32,708
Potentially dilutive shares issuable from Convertible Senior Notes, if-converted	2,850		—			—
Potentially dilutive shares issuable from stock options and unvested RSUs	1,709		—			—
Diluted weighted-average common shares outstanding, if-converted	42,554		33,734			32,708
Potentially dilutive shares excluded from calculation due to anti-dilutive effect	161		37			2,770