PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,251,217	$ 705,166
Less: accumulated depreciation and accretion	(24,320)	(5,580)
Total property, plant and equipment, net	1,226,897	699,586
Gathering, processing and transmission systems and facilities
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	729,585	423,600
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	521,609	281,566
Capitalized interest	6,900	3,400
Other property and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 23	$ 0