Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2013

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:

	March 31, 2013						December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Carrying Value		Gross Carrying Amount		Accumulated Amortization		Carrying Value
Refinery Services:
Customer relationships	$	94,654	$	70,946	$	23,708	$	94,654	$	69,167	$	25,487
Licensing agreements	38,678		23,683		14,995		38,678		22,892		15,786
Supplier relationships	—		—		—		36,469		36,469		—
Segment total	133,332		94,629		38,703		169,801		128,528		41,273
Supply & Logistics:
Customer relationships	35,430		26,944		8,486		35,430		26,403		9,027
Intangibles associated with lease	13,260		2,683		10,577		13,260		2,565		10,695
Trade names	—		—		—		18,888		18,888		—
Segment total	48,690		29,627		19,063		67,578		47,856		19,722
Other	19,716		5,260		14,456		18,932		4,862		14,070
Total	$	201,738	$	129,516	$	72,222	$	256,311	$	181,246	$	75,065

Amortization Expense

Our amortization expense for the periods presented was as follows:

	Three Months Ended March 31,
	2013		2012
Amortization expense	$	3,627	$	5,515

Schedule of Expected Amortization Expense

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

Remainder of	2013	$	10,929
	2014	$	12,422
	2015	$	10,614
	2016	$	9,152
	2017	$	7,989