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UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 805,032 | $ 861,844 | $ 969,150
Equity method goodwill | 16,500 | 38,800 |
Equity in net earnings from investments | 143,241 | 154,541 | 158,383
Impairment of equity investments | (37,730) | 0 | 0
Accounts Payable, Related Parties, Current | 8,400 | 13,500 |
Payments to Acquire Equity Method Investments | 20,000 |  |
Natural Gas Gathering And Processing |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 22,757 | 34,426 | 42,630
Equity in net earnings from investments | (1,123) | (6,292) | 410
Natural Gas Liquids [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | 423,494 | 439,393 | 451,040
Equity in net earnings from investments | 39,938 | 65,123 | 67,126
Unconsolidated Affiliates [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 135,400 | 164,700 | 153,900
Northern Border Pipeline [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Investments in unconsolidated affiliates | $ 291,987 | 307,209 |
Equity in net earnings from investments | 75,409 | 68,871 | 67,854
Payments to Acquire Equity Method Investments | $ 0 | 0 | 0
Distributions paid to us |  | 50,000 |
Cash Distribution Percentage of Equity Method Investment | 100.00% |  |
Tiered Rate Reduction | 12.50% |  |
Overland Pass Pipeline Company [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net ownership percentage | 50.00% |  |
Investments in unconsolidated affiliates | $ 409,573 | 417,473 |
Equity in net earnings from investments | $ 38,618 | 63,698 | 65,887
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 | $ 66,794 | 80,816 |
Equity in net earnings from investments | $ 29,017 | 26,839 | 22,993
Cash Distribution Percentage of Equity Method Investment | 100.00% |  |
Other Unconsolidated Affiliates [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 36,678 | 56,346 |
Equity in net earnings from investments | $ 197 | $ (4,867) | $ 1,649
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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