EQUITY METHOD INVESTMENTS - Summarized Financial Information of Equity Method Investments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Operating income	[1]	$ 19,065	$ 31,554
Net income	[1]	21,389	18,136
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Gulf Coast Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Revenues		89,973	88,369
Operating income		63,443	60,108
Net income		63,529	59,768
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Permian Highway Pipeline LLC(1)
Schedule of Equity Method Investments [Line Items]
Revenues		97,856	97,848
Operating income		59,476	42,580
Net income		59,213	42,580
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Breviloba, LLC
Schedule of Equity Method Investments [Line Items]
Revenues		48,521	34,529
Operating income		26,314	17,300
Net income		$ 26,366	$ 17,359

[1] The results of the legacy ALTM business are not included in the Company’s consolidated financials prior to February 22, 2022. Refer to the Form 10-Q basis of presentation in Note 1—Description of the Organization and Summary of Significant Accounting Policies, for further information on the Company’s basis of presentation.