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Acquisitions Big Spring Acquisition (Tables)
 9 Months Ended
Sep. 30, 2018
Business Acquisition [Line Items]  
Schedule of Asset Acquisitions, by Acquisition [Table Text Block] The following table summarizes the allocation of the relative fair value assigned to the asset groups for the Big Spring Pipeline (in thousands):

Property, plant and equipment
 
$
6,443

Intangible assets (1)
 
2,560

     Total
 
$
9,003