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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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