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Segment Data - PP&E (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Property, plant and equipment	$ 446,961	$ 446,961	$ 367,179
Less: accumulated depreciation	(127,628)	(127,628)	(112,111)
Property, plant and equipment, net	319,333	319,333	$ 255,068
Depreciation expense	6,930	12,930
Pipelines and transportation
Segment Reporting Information [Line Items]
Property, plant and equipment	362,128	362,128
Less: accumulated depreciation	(96,915)	(96,915)
Property, plant and equipment, net	265,213	265,213
Depreciation expense	5,594	10,524
Wholesale marketing and terminalling
Segment Reporting Information [Line Items]
Property, plant and equipment	84,833	84,833
Less: accumulated depreciation	(30,713)	(30,713)
Property, plant and equipment, net	54,120	54,120
Depreciation expense	$ 1,336	$ 2,406

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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