PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,391,341	$ 1,251,217
Less: accumulated depreciation and amortization	(31,608)	(24,320)
Total property, plant and equipment, net	1,359,733	1,226,897
Gathering, processing and transmission systems and facilities
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	824,687	729,585
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	528,837	521,609
Capitalized interest	5,400	6,900
Finance lease asset
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	34,749
Other property and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 3,068	$ 23