EARNINGS PER COMMON UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net (loss) income attributable to the period	$ (21,752)	$ 2,265	$ (163,921)	$ 36,044
Less: net income allocated to participating securities	(4)	(21)	(24)	(63)
Net (loss) income attributable to common unitholders	$ (21,756)	$ 2,244	$ (163,945)	$ 35,981
Basic weighted average common units outstanding (in shares)	67,831,000	62,628,000	67,827,000	59,058,000
Effect of dilutive securities:
Effect of dilutive securities: Potential common units issuable (in shares)	0	36,000	0	36,000
Diluted weighted average common units outstanding (in shares)	67,831,000	62,664,000	67,827,000	59,094,000
Net income per common unit, basic (in USD per share)	$ (0.32)	$ 0.04	$ (2.42)	$ 0.61
Net income per common unit, diluted (in USD per share)	$ (0.32)	$ 0.04	$ (2.42)	$ 0.61
Anti-dilutive for potentially dilute basic earnings per common unit (in shares)	0		0