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GOODWILL AND INTANGIBLE ASSETS (Notes) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND INTANGIBLE ASSETS | GOODWILL AND INTANGIBLE ASSETS Goodwill - The following table sets forth our goodwill, by segment, for the periods indicated:
|  | December 31, 2019 |  | December 31, 2018
|  | (Thousands of dollars)
Natural Gas Gathering and Processing |  | $ | 153,404 |  |  | $ | 153,404 |
Natural Gas Liquids |  | 371,217 |  |  | 371,217 |
Natural Gas Pipelines |  | 156,375 |  |  | 156,479 |
Total goodwill |  | $ | 680,996 |  |  | $ | 681,100 |
Intangible Assets - Our intangible assets relate primarily to contracts acquired through acquisitions in our Natural Gas Gathering and Processing and Natural Gas Liquids segments, which are being amortized over periods of 15 to 40 years. Amortization expense for intangible assets was $11.9 million in 2019, 2018 and 2017, and the aggregate amortization expense for each of the next five years is estimated to be $11.9 million. The following table reflects the gross carrying amount and accumulated amortization of intangible assets for the periods presented:
|  | December 31, 2019 |  | December 31, 2018
|  | (Thousands of dollars)
Gross intangible assets |  | $ | 414,345 |  |  | $ | 411,650 |
Accumulated amortization |  | (137,508 | ) |  | (125,608 | )
Net intangible assets |  | $ | 276,837 |  |  | $ | 286,042 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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