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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 25,328	$ 34,118	$ 69,955	$ 77,599
Accounts Payable, Related Parties, Current	9,700		9,700		$ 13,500
Impairment of equity investments	0	0	(37,730)	0
Equity-method goodwill	16,500		16,500
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Parties	41,800	40,500	87,100	82,300
Northern Border Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	12,871	13,689	34,991	34,491
Overland Pass Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	7,972	15,465	22,083	32,859
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	6,809	6,077	13,242	12,415
Other Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ (2,324)	$ (1,113)	(361)	$ (2,166)
Natural Gas Liquids | Chisholm Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Impairment of equity investments			$ (7,200)
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Natural Gas Gathering And Processing [Member] | Venice Energy Services Company [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)

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