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GOODWILL AND INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill by Segment 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 
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,
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