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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 680,996 | $ 681,100 |
Amortization expense for intangible assets | 11,900 | 11,900 | $ 11,900
Gross intangible assets and accumulated amortization [Abstract] |  |  |
Gross intangible assets | 414,345 | 411,650 |
Accumulated amortization | (137,508) | (125,608) |
Net intangible assets | 276,837 | 286,042 |
Future amortization expense for next five years [Abstract] |  |  |
Future amortization expense, year one | 11,900 |  |
Future amortization expense, year two | 11,900 |  |
Future amortization expense, year three | 11,900 |  |
Future amortization expense, year four | 11,900 |  |
Future amortization expense, year five | $ 11,900 |  |
Natural Gas Gathering And Processing and Natural Gas Liquids [Member] | Minimum [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |
Natural Gas Gathering And Processing and Natural Gas Liquids [Member] | Maximum [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 40 years |  |
Natural Gas Gathering and Processing |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 153,404 | 153,404 |
Natural Gas Liquids |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 371,217 | 371,217 |
Natural Gas Pipelines |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 156,375 | $ 156,479 |

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