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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 452,746	$ 367,179
Less: accumulated depreciation	(140,184)	(112,111)
Property, plant and equipment, net	312,562	255,068
Depreciation expense	25,901	20,851
Pipelines and Transportation
Property, Plant and Equipment [Line Items]
Property, plant and equipment	361,702	300,134
Less: accumulated depreciation	(106,971)	(84,435)
Property, plant and equipment, net	254,731	215,699
Depreciation expense	21,115	17,268
Wholesale Marketing and Terminalling
Property, Plant and Equipment [Line Items]
Property, plant and equipment	91,044	67,045
Less: accumulated depreciation	(33,213)	(27,676)
Property, plant and equipment, net	57,831	39,369
Depreciation expense	4,786	3,583
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,458	4,440
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	3,695	2,804
Pipelines, tanks and terminals
Property, Plant and Equipment [Line Items]
Property, plant and equipment	410,154	314,251
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	15,838	14,650
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 16,528	$ 28,961

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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