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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Entity Information [Line Items] |  |  |  |  |
Effective Income Tax Rate |  |  | 60.00% |  |
Goodwill | $ 527,592 |  | $ 527,592 |  | $ 680,996
Impairment of equity investments | 0 | $ 0 | 37,730 | $ 0 |
Natural Gas Gathering And Processing [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Impairment of long-lived assets |  |  | 380,500 |  |
Impairment of intangible assets |  |  | 19,900 |  |
Goodwill | $ 0 |  | 0 |  | 153,404
Goodwill impairment charge |  |  | $ 153,400 |  |
Natural Gas Gathering And Processing [Member] | Venice Energy Services Company [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 10.20% |  | 10.20% |  |
Impairment of equity investments - goodwill |  |  | $ 22,300 |  |
Impairment of equity investments |  |  | 30,500 |  |
Natural Gas Liquids |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Impairment of long-lived assets |  |  | 70,200 |  |
Goodwill | $ 371,217 |  | $ 371,217 |  | 371,217
Natural Gas Liquids | Chisholm Pipeline Company [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  |
Impairment of equity investments |  |  | $ 7,200 |  |
Natural Gas Pipelines |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Goodwill | $ 156,375 |  | $ 156,375 |  | $ 156,375

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