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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 |

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