Earnings (Loss) Per Share - Reconciliation of Shares in the Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income (loss)	$ (11,624)	$ 12,845	$ (18,784)	$ 13,260
Earnings allocated to unvested restricted stock	0	(73)	0	(91)
Net income (loss) available to common stockholders	$ (11,624)	$ 12,772	$ (18,784)	$ 13,169
Weighted-average common shares outstanding used in computing basic earnings (loss) per share (in shares)	157,854	155,122	157,491	154,795
Net income (loss) available to common stockholders	$ (11,624)	$ 12,772	$ (18,784)	$ 13,169
Denominator:
Weighted-average shares used in computing basic earnings (loss) per share (in shares)	157,854	155,122	157,491	154,795
Add dilutive impact of employee equity plans (in shares)	0	2,327	0	2,142
Weighted-average shares used in computing diluted earnings (loss) per share (in shares)	157,854	157,449	157,491	156,937