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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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