EQUITY METHOD INTERESTS - Information of Equity Method Investments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	[2]	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity method interests		$ 1,566,672			$ 1,566,672	$ 1,555,182	[1]
Difference between carrying amount and underlying equity					$ 37,400	37,700
Movement In Equity Method Interests [Roll Forward]
Balance at December 31, 2020	[1]	1,555,182
Contributions		20,522	$ 82,827
Distributions		(31,350)
Equity income (loss), net		21,688	$ 15,842	[3]
Accumulated other comprehensive income		630
Balance at March 31, 2021		1,566,672
Gulf Coast Express Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					16.00%
Equity method interests		283,530			$ 280,787	283,530
Movement In Equity Method Interests [Roll Forward]
Balance at December 31, 2020		283,530
Contributions		0
Distributions		(12,257)
Equity income (loss), net		9,514
Accumulated other comprehensive income		0
Balance at March 31, 2021		280,787
EPIC Crude Holdings, LP
Schedule of Equity Method Investments [Line Items]
Ownership percentage					15.00%
Equity method interests		172,592			$ 172,592	176,640
Movement In Equity Method Interests [Roll Forward]
Balance at December 31, 2020		176,640
Contributions		0
Distributions		0
Equity income (loss), net		(4,678)
Accumulated other comprehensive income		630
Balance at March 31, 2021		172,592
Permian Highway Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					26.70%
Equity method interests		638,723			$ 638,723	615,186
Undistributed earnings					$ 3,200
Movement In Equity Method Interests [Roll Forward]
Balance at December 31, 2020		615,186
Contributions		20,522
Distributions		(8,203)
Equity income (loss), net		11,218
Accumulated other comprehensive income		0
Balance at March 31, 2021		638,723
Breviloba, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage					33.00%
Equity method interests		479,826			$ 474,570	$ 479,826
Movement In Equity Method Interests [Roll Forward]
Balance at December 31, 2020		479,826
Contributions		0
Distributions		(10,890)
Equity income (loss), net		5,634
Accumulated other comprehensive income		0
Balance at March 31, 2021		$ 474,570

[1] The Consolidated Balance Sheet as of December 31, 2020 has been derived from the audited consolidated financial statements, revised to reflect the Company’s fair value change of its underlying warrants. Refer to Note 1—Summary of Significant Accounting Policies, see the section titled Revision of Previously Issued Consolidated Financial Statements for Immaterial Adjustment for further information.

[2] This period presented has been revised to reflect the Company’s fair value change of its underlying warrants. Refer to Note 1—Summary of Significant Accounting Policies, see the section titled Revision of Previously Issued Consolidated Financial Statements for Immaterial Adjustment for further information.

[3] This period presented has been revised to reflect the Company’s fair value change of its underlying warrants. Refer to Note 1—Summary of Significant Accounting Policies, see the section titled Revision of Previously Issued Consolidated Financial Statements for Immaterial Adjustment for further information.