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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 681,100 | $ 681,100 |
Amortization expense for intangible assets | 11,900 | 11,900 | $ 11,900
Gross intangible assets and accumulated amortization [Abstract] |  |  |
Gross intangible assets | 411,650 | 426,068 |
Accumulated amortization | (125,608) | (113,708) |
Net intangible assets | 286,042 | 312,360 |
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 | 20 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 | $ 156,479 | $ 156,479 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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