EARNINGS PER UNIT (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Net (loss) income attributable to limited partners	$ (10,645)	$ 54,151	$ (42,762)	$ (2,948)
Phantom Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Effect of nonvested phantom units		400
(Loss) income per limited partner unit:
Nonvested anti-dilutive phantom units excluded from the calculation of diluted EPU	176	1	70	2
Series A Preferred Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Net (loss) income attributable to limited partners	$ 7,125	$ 7,125	$ 21,375	$ 21,375
Common units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Net (loss) income attributable to limited partners	$ (17,770)	$ 47,026	$ (64,137)	$ (24,323)
Weighted-average common units outstanding – basic	82,718	73,356	80,429	73,283
Weighted-average common units outstanding – diluted	82,718	73,756	80,429	73,283
Common unit – basic	$ (0.21)	$ 0.64	$ (0.80)	$ (0.33)
Common unit – diluted	$ (0.21)	$ 0.64	$ (0.80)	$ (0.33)