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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 44,627	$ 43,481
Accounts Payable, Related Parties, Current	14,700		$ 13,500
Impairment of equity investments	(37,730)	0
Equity-method goodwill	16,500
Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Parties	45,300	41,800
Northern Border Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	22,120	20,802
Overland Pass Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	14,111	17,394
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	6,433	6,338
Other Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	1,963	$ (1,053)
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%
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%
Impairment of equity investments - goodwill	$ (22,300)

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