Net 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
Numerators:
Net loss	$ (19,969)	$ (31,868)	$ (449,636)	$ (56,256)
Less: Income attributable to unvested restricted stock awards	0	0	0	0
Numerator for basic net loss per share	(19,969)	(31,868)	(449,636)	(56,256)
Effect of dilutive securities:
Unvested restricted stock awards	0	0	0	0
Numerator for diluted net loss per share	$ (19,969)	$ (31,868)	$ (449,636)	$ (56,256)
Denominators:
Weighted average number of common shares outstanding (in shares)	61,028	60,493	60,928	60,400
Less: Weighted average number of unvested restricted stock awards outstanding (in shares)	(1,157)	(1,070)	(1,140)	(1,038)
Denominator for basic and diluted net loss per share (in shares)	59,871	59,423	59,788	59,362
Net loss per share:
Basic (in dollars per share)	$ (0.33)	$ (0.54)	$ (7.52)	$ (0.95)
Diluted (in dollars per share)	$ (0.33)	$ (0.54)	$ (7.52)	$ (0.95)