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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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