EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ (26,344)	$ 41,564	$ (54,335)	$ (6,480)	$ 15,220	$ (60,815)
Less: Deemed dividend	(147)		0		(147)	0
Less: Income attributable to participating securities - basic	0		0		(322)	0
Net Income (Loss) Available to Common Stockholders, Basic	$ (26,491)		$ (54,335)		$ 14,751	$ (60,815)
Weighted-average common shares outstanding - basic (in shares)	112,569		80,739		111,189	79,107
Net income (loss) per share applicable to common stockholders - basic (in dollars per share)	$ (0.24)		$ (0.67)		$ 0.13	$ (0.77)
Less: Income attributable to participating securities - diluted	$ 0		$ 0		$ (2,473)
Net Income (Loss) Available to Common Stockholders, Diluted	$ (26,491)		$ (54,335)		$ 12,600	$ (60,815)
Stock options and employee stock purchase plan (in shares)	0		0		14	0
Weighted-average common shares outstanding - diluted (in shares)	112,569		80,739		111,203	79,107
Net income (loss) per share applicable to common stockholders - diluted (in dollars per share)	$ (0.24)		$ (0.67)		$ 0.11	$ (0.77)