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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ 38,046	$ 37,576	$ 108,001	$ 115,175
Accounts Payable, Related Parties, Current	13,300		13,300		$ 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	35,800	41,900	108,400	124,200
Northern Border Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	22,037	16,102	57,028	50,593
Overland Pass Pipeline
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	8,007	15,481	30,090	48,340
Roadrunner
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	8,033	7,421	21,275	19,836
Other Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Equity in net earnings from investments	$ (31)	$ (1,428)	(392)	$ (3,594)
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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