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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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