Intangible Assets

9 Months Ended

Sep. 30, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Assets

Intangible Assets

The following table summarizes the components of our intangible assets at the dates indicated:

	September 30, 2016						December 31, 2015
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Refinery Services:
Customer relationships	$	94,654	$	88,888	$	5,766	$	94,654	$	86,285	$	8,369
Licensing agreements	38,678		33,577		5,101		38,678		31,694		6,984
Segment total	133,332		122,465		10,867		133,332		117,979		15,353
Supply & Logistics:
Customer relationships	35,430		33,268		2,162		35,430		32,044		3,386
Intangibles associated with lease	13,260		4,341		8,919		13,260		3,986		9,274
Segment total	48,690		37,609		11,081		48,690		36,030		12,660
Marine contract intangibles	27,000		4,950		22,050		27,000		900		26,100
Offshore pipeline contract intangibles	158,101		9,708		148,393		158,101		3,467		154,634
Other	28,240		9,918		18,322		22,819		8,120		14,699
Total	$	395,363	$	184,650	$	210,713	$	389,942	$	166,496	$	223,446

Our amortization of intangible assets for the periods presented was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Amortization of intangible assets	$	6,122	$	5,554	$	18,154	$	13,745

We estimate that our amortization expense for the next five years will be as follows:

Remainder of	2016	$	6,169
	2017	$	23,532
	2018	$	21,361
	2019	$	17,026
	2020	$	16,125