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GOODWILL AND INTANGIBLE ASSETS (Notes)
 12 Months Ended
Dec. 31, 2020
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,
2020		December 31,
2019
 
(Thousands of dollars)
Natural Gas Gathering and Processing$— $153,404 
Natural Gas Liquids371,217 371,217 
Natural Gas Pipelines156,375 156,375 
Total goodwill$527,592 $680,996 

Impairment Charges - Based on the results of our goodwill impairment test in the first quarter 2020, we concluded that the carrying value of the Natural Gas Gathering and Processing reporting unit exceeded its estimated fair value, resulting in a noncash impairment charge of $153.4 million, which is included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020. For additional information on our impairment charges, see Note A.

Intangible Assets - Our intangible assets relate primarily to contracts acquired through acquisitions in our Natural Gas Liquids and Natural Gas Gathering and Processing segments, which are being amortized over periods of 15 to 40 years. Amortization expense for intangible assets was $10.8 million in 2020 and $11.9 million in 2019 and 2018, and the aggregate amortization expense for each of the next five years is estimated to be $10.4 million. The following table reflects the gross carrying amount and accumulated amortization of intangible assets for the periods presented:
December 31,
2020		December 31,
2019
 
(Thousands of dollars)
Gross intangible assets$381,435 $414,345 
Accumulated amortization(135,304)(137,508)
Net intangible assets$246,131 $276,837 

Impairment Charges - In our Natural Gas Gathering and Processing segment, we recorded noncash impairment charges to intangible assets of $19.9 million related to supply contracts associated with our natural gas processing plant in the Powder River Basin, which was also impaired. These charges are included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020. For additional information on our impairment charges, see Note A.