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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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