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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 797,613 | $ 805,032 | $ 861,844
Equity method goodwill | 16,500 | 16,500 |
Equity in net earnings from investments | 122,520 | 143,241 | 154,541
Impairment of equity investments | 0 | (37,730) | 0
Payments to Acquire Equity Method Investments |  | 20,000 |
Natural Gas Gathering And Processing |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 27,018 | 22,757 | 34,426
Equity in net earnings from investments | 3,757 | (1,123) | (6,292)
Natural Gas Liquids [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 416,648 | 423,494 | 439,393
Equity in net earnings from investments | 21,000 | 39,938 | 65,123
Unconsolidated Affiliates [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 62,800 | 135,400 | 164,700
Northern Border Pipeline [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Investments in unconsolidated affiliates | $ 283,170 | 291,987 |
Equity in net earnings from investments | 64,470 | 75,409 | 68,871
Payments to Acquire Equity Method Investments | $ 0 | 0 | 0
Distributions paid to us |  |  | 50,000
Cash Distribution Percentage of Equity Method Investment | 100.00% |  |
Overland Pass Pipeline Company [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Investments in unconsolidated affiliates | $ 403,011 | 409,573 |
Equity in net earnings from investments | $ 19,434 | 38,618 | 63,698
Cash Distribution Percentage of Equity Method Investment | 100.00% |  |
Overland Pass Pipeline Company [Member] | Natural Gas Liquids [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Roadrunner Gas Transmission [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Investments in unconsolidated affiliates | $ 70,777 | 66,794 |
Equity in net earnings from investments | $ 33,293 | 29,017 | 26,839
Cash Distribution Percentage of Equity Method Investment | 100.00% |  |
Other Unconsolidated Affiliates [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 40,655 | 36,678 |
Equity in net earnings from investments | $ 5,323 | $ 197 | $ (4,867)
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage |  | 10.20% |
Impairment of equity investments |  | $ (30,500) |
ImpairmentOfEquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity |  | $ (22,300) |
Chisholm Pipeline Company [Member] | Natural Gas Liquids [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage |  | 50.00% |
Impairment of equity investments |  | $ (7,200) |

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