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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Goodwill	$ 527,592	$ 680,996
Amortization expense for intangible assets	10,800	11,900	$ 11,900
Gross intangible assets and accumulated amortization [Abstract]
Gross intangible assets	381,435	414,345
Accumulated amortization	(135,304)	(137,508)
Net intangible assets	246,131	276,837
Future amortization expense for next five years [Abstract]
Future amortization expense, year one	10,400
Future amortization expense, year two	10,400
Future amortization expense, year three	10,400
Future amortization expense, year four	10,400
Future amortization expense, year five	10,400
Natural Gas Liquids [Member]
Segment Reporting Information [Line Items]
Goodwill	371,217	371,217
Natural Gas Pipelines
Segment Reporting Information [Line Items]
Goodwill	156,375	156,375
Natural Gas Gathering and Processing
Segment Reporting Information [Line Items]
Goodwill	0	$ 153,404
Goodwill, Impairment Loss	153,400
Impairment of Intangible Assets (Excluding Goodwill)	$ 19,900
Natural Gas Gathering And Processing and Natural Gas Liquids [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Natural Gas Gathering And Processing and Natural Gas Liquids [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Finite-Lived Intangible Asset, Useful Life	40 years

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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