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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Entity [Line Items] |  |  |  |
Contract Liabilities, Contract Term | 5 to 10 years |  |  |
Number Of Years Of Service Employees Must Work To Be Entitled To Postretirement Medical And Life Insurance Benefits |  |  |  | 5 years
Impairment of equity investments | $ 37,730 | $ 0 | $ 0 |
Natural Gas Gathering And Processing |  |  |  |
Entity [Line Items] |  |  |  |
Impairment charges | 362,300 |  |  |
Goodwill, Impairment Loss | 153,400 |  |  |
Impairment charges - long lived and other assets | 382,200 |  |  |
Natural Gas Liquids |  |  |  |
Entity [Line Items] |  |  |  |
Impairment charges | $ 71,600 |  |  |
Venice Energy Services Company [Member] | Natural Gas Gathering And Processing |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 10.20% |  |  |
Impairment of equity investments | $ 30,500 |  |  |
Impairment of equity investments - goodwill | $ 22,300 |  |  |
Chisholm Pipeline Company [Member] | Natural Gas Liquids |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 50.00% |  |  |
Impairment of equity investments | $ 7,200 |  |  |
Northern Border Pipeline [Member] |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 50.00% |  |  |
Northern Border Pipeline [Member] | Natural Gas Pipelines |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 50.00% |  |  |
Roadrunner Gas Transmission [Member] |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 50.00% |  |  |
Roadrunner Gas Transmission [Member] | Natural Gas Pipelines |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 50.00% |  |  |
Overland Pass Pipeline Company [Member] |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 50.00% |  |  |
Overland Pass Pipeline Company [Member] | Natural Gas Liquids |  |  |  |
Entity [Line Items] |  |  |  |
Net ownership percentage | 50.00% |  |  |

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