Intangible Assets

9 Months Ended

Sep. 30, 2014

7. Intangible Assets

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



	September 30, 2014						December 31, 2013
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Refinery Services:
Customer relationships	$	94,654	$	80,481	$	14,173	$	94,654	$	76,283	$	18,371
Licensing agreements	38,678		28,251		10,427		38,678		26,055		12,623
Segment total	133,332		108,732		24,600		133,332		102,338		30,994
Supply & Logistics:
Customer relationships	35,430		29,813		5,617		35,430		28,568		6,862
Intangibles associated with lease	13,260		3,394		9,866		13,260		3,039		10,221
Segment total	48,690		33,207		15,483		48,690		31,607		17,083
Other	22,314		7,951		14,363		21,356		6,505		14,851
Total	$	204,336	$	149,890	$	54,446	$	203,378	$	140,450	$	62,928

Our amortization expense for the periods presented was as follows:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Amortization expense	$	3,148	$	3,656	$	9,440	$	10,892

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