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GOODWILL AND INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill by Segment 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
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,
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