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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 25,720	$ 25,328	$ 59,040	$ 69,955
Impairment of equity investments	0	0	0	(37,730)
Natural Gas Gathering And Processing [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	442	(2,149)	2,170	(1,343)
Natural Gas Liquids
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	5,090	7,797	8,694	23,065
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Parties	12,500	41,800	28,000	87,100
Northern Border Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	12,586	12,871	32,825	34,991
Overland Pass Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	4,739	7,972	7,711	22,083
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	7,602	6,809	15,351	13,242
Other Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 793	$ (2,324)	$ 3,153	(361)
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing [Member]
Schedule of Equity Method Investments [Line Items]
Impairment of equity investments				$ (30,500)
Equity Method Investment, Ownership Percentage		10.20%		10.20%
Impairment of equity investments - goodwill				$ (22,300)
Chisholm Pipeline Company [Member] | Natural Gas Liquids
Schedule of Equity Method Investments [Line Items]
Impairment of equity investments				$ (7,200)
Equity Method Investment, Ownership Percentage		50.00%		50.00%

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