GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill by Segment

The following table sets forth our goodwill, by segment, for the periods indicated:

	December 31, 2017		December 31, 2016
	(Thousands of dollars)
Natural Gas Gathering and Processing	$	153,404	$	122,291
Natural Gas Liquids	371,217		268,544
Natural Gas Pipelines	156,479		134,700
Total goodwill	$	681,100	$	525,535

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, 2017			December 31, 2016
	(Thousands of dollars)
Gross intangible assets	$	426,068		$	581,633
Accumulated amortization	(113,708		)	(101,809		)
Net intangible assets	$	312,360		$	479,824