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Acquisitions North Little Rock Acquisition (Details) (North Little Rock Terminal [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Oct. 24, 2013
North Little Rock Terminal [Member]
Business Acquisition [Line Items]
Property, Plant, and Equipment					$ 4,990
Intangible Assets					10
Total Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					5,000
Revenue since Acquisition Date	400		700
Net Income since Acquisition Date	200		400
Pro Forma Net Sales		230,501		441,755
Pro Forma Net Income		$ 6,780		$ 14,260

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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