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Subsequent Events (Notes)
 6 Months Ended
Jun. 30, 2015
Subsequent Event [Line Items]  
Subsequent Events [Text Block]
13. Subsequent Events
On July 28, 2015, the Company acquired all of the outstanding partnership interests of Stagecoach Cartage and Distribution LP for a total purchase price of $35.0 million, plus an earnout capped at $5.0 million. The acquisition was financed with borrowings under the Company's credit facility discussed in Note 5.