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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 33,320	$ 44,627
Accounts Payable, Related Parties, Current	5,200		$ 8,400
Impairment of equity investments	0	(37,730)
Natural Gas Gathering And Processing [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	1,728	806
Natural Gas Liquids
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	3,604	15,268
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Parties	15,600	45,300
Northern Border Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	20,239	22,120
Overland Pass Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	2,972	14,111
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	7,749	6,433
Other Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 2,360	1,963
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%
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%

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