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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 805,032	$ 861,844	$ 969,150
Equity method goodwill	16,500	38,800
Equity in net earnings from investments	143,241	154,541	158,383
Impairment of equity investments	(37,730)	0	0
Accounts Payable, Related Parties, Current	8,400	13,500
Payments to Acquire Equity Method Investments	20,000
Natural Gas Gathering And Processing
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	22,757	34,426	42,630
Equity in net earnings from investments	(1,123)	(6,292)	410
Natural Gas Liquids [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	423,494	439,393	451,040
Equity in net earnings from investments	39,938	65,123	67,126
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 135,400	164,700	153,900
Northern Border Pipeline [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 291,987	307,209
Equity in net earnings from investments	75,409	68,871	67,854
Payments to Acquire Equity Method Investments	$ 0	0	0
Distributions paid to us		50,000
Cash Distribution Percentage of Equity Method Investment	100.00%
Tiered Rate Reduction	12.50%
Overland Pass Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Net ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 409,573	417,473
Equity in net earnings from investments	$ 38,618	63,698	65,887
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	$ 66,794	80,816
Equity in net earnings from investments	$ 29,017	26,839	22,993
Cash Distribution Percentage of Equity Method Investment	100.00%
Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 36,678	56,346
Equity in net earnings from investments	$ 197	$ (4,867)	$ 1,649
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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