EQUITY METHOD INVESTMENTS - Summarized Financial Information of Equity Method Investments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Operating income	[1]	$ 40,611	$ 644	$ 59,676	$ 32,198
Net income	[1]	131,448	(15,366)	152,837	2,770
Permian Highway Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Revenues		98,808	99,366	196,664	197,214
Operating income		61,294	62,444	120,770	105,024
Net income		61,307	62,329	120,520	104,909
Breviloba, LLC
Schedule of Equity Method Investments [Line Items]
Revenues		50,091	47,447	98,612	81,976
Operating income		25,359	28,002	51,672	45,302
Net income		25,284	27,645	51,651	45,004
Gulf Coast Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Revenues		90,769	90,703	180,742	179,072
Operating income		64,816	60,766	128,259	120,874
Net income		$ 64,461	$ 60,551	$ 127,990	$ 120,319

[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 in the Notes to our Condensed Consolidated Financial Statements in this Form 10-Q for further information.