Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule Of Components Of Intangible Assets

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

	June 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	$	88,021	$	6,633	$	94,654	$	86,285	$	8,369
Licensing agreements	38,678		32,949		5,729		38,678		31,694		6,984
Segment total	133,332		120,970		12,362		133,332		117,979		15,353
Supply & Logistics:
Customer relationships	35,430		32,860		2,570		35,430		32,044		3,386
Intangibles associated with lease	13,260		4,223		9,037		13,260		3,986		9,274
Segment total	48,690		37,083		11,607		48,690		36,030		12,660
Marine contract intangibles	27,000		3,600		23,400		27,000		900		26,100
Offshore pipeline contract intangibles	158,101		7,628		150,473		158,101		3,467		154,634
Other	27,678		9,246		18,432		22,819		8,120		14,699
Total	$	394,801	$	178,527	$	216,274	$	389,942	$	166,496	$	223,446

Amortization Expense

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Amortization of intangible assets	$	6,040	$	4,154	$	12,032	$	8,191

Schedule of Expected Amortization Expense

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

Remainder of	2016	$	12,285
	2017	$	23,425
	2018	$	21,309
	2019	$	16,982
	2020	$	16,081