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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 28,573	$ 38,046	$ 87,613	$ 108,001
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	499	(42)	2,669	(1,385)
Natural Gas Liquids
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	5,384	8,018	14,078	31,083
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Parties	16,200	35,800	44,200	108,400
Northern Border Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	14,634	22,037	47,459	57,028
Overland Pass Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	5,241	8,007	12,952	30,090
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	8,056	8,033	23,407	21,275
Other Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 642	$ (31)	$ 3,795	(392)
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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