NET (LOSS) INCOME PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic net income (loss) per share
Net (loss) income	$ (192,626)	$ 3,331	$ (13,605)	$ (14,301)	$ (24,138)	$ 48,270	$ (21,048)	$ 33,824	$ (217,201)	$ 36,908	$ (102,496)
Weighted average common shares outstanding (in shares)									70,716	63,794	62,702
Basic net (loss) income per share (in dollars per share)	$ (2.65)	$ 0.05	$ (0.21)	$ (0.22)	$ (0.38)	$ 0.76	$ (0.33)	$ 0.53	$ (3.07)	$ 0.58	$ (1.63)
Diluted net income (loss) per share
Add: effect of dilutive securities (in shares)									0	414	0
Denominator for diluted income (loss) per share (in shares)									70,716	64,208	62,702
Diluted net (loss) income per share (in dollars per share)	$ (2.65)	$ 0.05	$ (0.21)	$ (0.22)	$ (0.38)	$ 0.65	$ (0.33)	$ 0.48	$ (3.07)	$ 0.57	$ (1.63)