NET INCOME (LOSS) PER COMMON SHARE - Basic and Diluted Net Income (loss) (Details) - USD ($) $ / shares in Units, $ 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, Basic [Abstract]
Net income (loss)	$ (53,811)	$ (9,138)	$ 25,992	$ 3,125	$ (62,949)	$ 29,116
Basic weighted average shares outstanding (in shares)	134,804,963		138,760,483		134,785,749	138,684,845
Net income (loss) per share - Basic (in dollars per share)	$ (0.40)		$ 0.19		$ (0.47)	$ 0.21
Earnings Per Share, Diluted [Abstract]
Net income (loss)	$ (53,811)	$ (9,138)	$ 25,992	$ 3,125	$ (62,949)	$ 29,116
Basic weighted average shares outstanding (in shares)	134,804,963		138,760,483		134,785,749	138,684,845
Effect of RSUs and options under the treasury stock method (in shares)	0		314,000		0	537,000
Diluted weighted average shares outstanding (in shares)	134,804,963		139,074,229		134,785,749	139,221,904
Net income (loss) per share - Diluted (in dollars per share)	$ (0.40)		$ 0.19		$ (0.47)	$ 0.21