Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment, Net (Details)

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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment, Net    
Refining facilities $ 744,690 $ 732,697
Accumulated depreciation (331,657) (312,143)
Property, plant and equipment, net $ 413,033 $ 420,554