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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 367,179 $ 342,407
Less: accumulated depreciation (112,111) (91,378)
Property, plant and equipment, net 255,068 251,029
Depreciation expense 20,851 19,750
Pipelines and Transportation    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 300,134 279,155
Less: accumulated depreciation (84,435) (67,032)
Property, plant and equipment, net 215,699 212,123
Depreciation expense 17,268 16,133
Wholesale Marketing and Terminalling    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 67,045 63,252
Less: accumulated depreciation (27,676) (24,346)
Property, plant and equipment, net 39,369 38,906
Depreciation expense 3,583 3,617
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 4,440 4,435
Building and building improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 2,804 2,236
Pipelines, tanks and terminals    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 314,251 305,302
Asset retirement obligation assets    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 2,073 2,073
Other equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 14,650 12,925
Construction in process    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 28,961 $ 15,436