EQUITY METHOD INVESTMENTS - Summarized Financial Information of Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Equity Method Investments [Line Items]
Operating income	$ 37,453	$ 40,611	$ 64,718	$ 59,676	[1]
Net income	71,668	131,448	75,967	152,837	[1]
Permian Highway Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Revenues	99,095	98,808	191,935	196,664
Operating income	63,507	61,294	120,312	120,770
Net income	64,342	61,307	124,032	120,520
Breviloba, LLC
Schedule of Equity Method Investments [Line Items]
Revenues	46,641	50,091	92,542	98,612
Operating income	22,547	25,359	44,496	51,672
Net income	22,651	25,284	44,863	51,651
Gulf Coast Express Pipeline LLC ("GCX")
Schedule of Equity Method Investments [Line Items]
Revenues	90,860	90,769	180,608	180,742
Operating income	66,256	64,816	131,472	128,259
Net income	$ 66,400	$ 64,461	$ 137,491	$ 127,990

[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 basis of presentation in Note 1—Description of the Organization and Summary of Significant Accounting Policies in the Notes to Condensed Consolidated Financial Statements in this Form 10-Q for further information.