Net Income (Loss) per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss)	$ (14,434)	$ 45,022	$ (2,050)	$ 280,949
Denominator:
Weighted-average shares used to compute net income (loss) per share-basic (in shares)	51,190	51,348	51,161	51,469
Dilutive restrictive stock awards (in shares)	166	134	114	130
Weighted-average shares used to compute net income (loss) per share-diluted (in shares)	51,356	51,482	51,275	51,599
Net income (loss) per share-basic (in dollars per share)	$ (0.28)	$ 0.88	$ (0.04)	$ 5.46
Net income (loss) per share-diluted (in dollars per share)	$ (0.28)	$ 0.87	$ (0.04)	$ 5.44