Intangible Assets

9 Months Ended

Sep. 30, 2012

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Assets

6. Intangible Assets

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

	September 30, 2012						December 31, 2011
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Refinery Services:
Customer relationships	$	94,654	$	67,403	$	27,251	$	94,654	$	62,111	$	32,543
Licensing agreements	38,678		22,038		16,640		38,678		19,476		19,202
Supplier relationships	36,469		35,878		591		36,469		34,105		2,364
Segment total	169,801		125,319		44,482		169,801		115,692		54,109
Supply & Logistics:
Customer relationships	35,430		25,698		9,732		35,430		23,584		11,846
Intangibles associated with lease	13,260		2,447		10,813		13,260		2,092		11,168
Trade names	18,888		18,888		—		18,888		17,048		1,840
Segment total	67,578		47,033		20,545		67,578		42,724		24,854
Other	18,467		4,354		14,113		17,292		2,899		14,393
Total	$	255,846	$	176,706	$	79,140	$	254,671	$	161,315	$	93,356

Our amortization expense for the periods presented was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Amortization expense	$	4,520	$	7,721	$	15,390	$	22,367

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

Remainder of	2012	$	4,520
	2013	$	14,597
	2014	$	12,297
	2015	$	10,489
	2016	$	9,028