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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 797,613	$ 805,032	$ 861,844
Equity method goodwill	16,500	16,500
Equity in net earnings from investments	122,520	143,241	154,541
Impairment of equity investments	0	(37,730)	0
Payments to Acquire Equity Method Investments		20,000
Natural Gas Gathering And Processing
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	27,018	22,757	34,426
Equity in net earnings from investments	3,757	(1,123)	(6,292)
Natural Gas Liquids [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	416,648	423,494	439,393
Equity in net earnings from investments	21,000	39,938	65,123
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 62,800	135,400	164,700
Northern Border Pipeline [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 283,170	291,987
Equity in net earnings from investments	64,470	75,409	68,871
Payments to Acquire Equity Method Investments	$ 0	0	0
Distributions paid to us			50,000
Cash Distribution Percentage of Equity Method Investment	100.00%
Overland Pass Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 403,011	409,573
Equity in net earnings from investments	$ 19,434	38,618	63,698
Cash Distribution Percentage of Equity Method Investment	100.00%
Overland Pass Pipeline Company [Member] | Natural Gas Liquids [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Roadrunner Gas Transmission [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 70,777	66,794
Equity in net earnings from investments	$ 33,293	29,017	26,839
Cash Distribution Percentage of Equity Method Investment	100.00%
Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 40,655	36,678
Equity in net earnings from investments	$ 5,323	$ 197	$ (4,867)
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing
Schedule of Equity Method Investments [Line Items]
Net ownership percentage		10.20%
Impairment of equity investments		$ (30,500)
ImpairmentOfEquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity		$ (22,300)
Chisholm Pipeline Company [Member] | Natural Gas Liquids [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage		50.00%
Impairment of equity investments		$ (7,200)

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