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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in net earnings from investments | $ 33,320 | $ 44,627 |
Accounts Payable, Related Parties, Current | 5,200 |  | $ 8,400
Impairment of equity investments | 0 | (37,730) |
Natural Gas Gathering And Processing [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in net earnings from investments | 1,728 | 806 |
Natural Gas Liquids |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in net earnings from investments | 3,604 | 15,268 |
Unconsolidated Affiliates [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Parties | 15,600 | 45,300 |
Northern Border Pipeline |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in net earnings from investments | 20,239 | 22,120 |
Overland Pass Pipeline |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in net earnings from investments | 2,972 | 14,111 |
Roadrunner |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in net earnings from investments | 7,749 | 6,433 |
Other Unconsolidated Affiliates |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in net earnings from investments | $ 2,360 | 1,963 |
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing [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) |
Chisholm Pipeline Company [Member] | Natural Gas Liquids |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Impairment of equity investments |  | $ (7,200) |
Equity Method Investment, Ownership Percentage |  | 50.00% |

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