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Acquisitions (Tables)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Nettleton Pipeline [Member]
Dec. 31, 2012
Big Sandy Terminal [Member]
Business Acquisition [Line Items]    
Schedule of Purchase Price Allocation [Table Text Block]
The allocation of the aggregate purchase price of the Nettleton Pipeline as of December 31, 2012 is summarized as follows (in thousands):
Property, plant and equipment
$
8,590

Intangible assets
2,240

Goodwill (all expected to be deductible for tax purposes)
1,415

   Total
$
12,245
The preliminary allocation of the aggregate purchase price of Big Sandy as of December 31, 2012 is summarized as follows (in thousands):
Property, plant and equipment
$
8,258

Intangible assets
1,229

Goodwill (all expected to be deductible for tax purposes)
1,540

     Total
$
11,027