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GOODWILL AND INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill by Segment | The following table sets forth our goodwill, by segment, for the periods indicated:
|  | December 31, 2018 |  | December 31, 2017
|  | (Thousands of dollars)
Natural Gas Gathering and Processing |  | $ | 153,404 |  |  | $ | 153,404 |
Natural Gas Liquids |  | 371,217 |  |  | 371,217 |
Natural Gas Pipelines |  | 156,479 |  |  | 156,479 |
Total goodwill |  | $ | 681,100 |  |  | $ | 681,100 |
Gross Carrying Amount and Accumulated Amortization of Intangible Assets | The following table reflects the gross carrying amount and accumulated amortization of intangible assets for the periods presented:
|  | December 31, 2018 |  | December 31, 2017
|  | (Thousands of dollars)
Gross intangible assets |  | $ | 411,650 |  |  | $ | 426,068 |
Accumulated amortization |  | (125,608 | ) |  | (113,708 | )
Net intangible assets |  | $ | 286,042 |  |  | $ | 312,360 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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