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Segment Data - PP&E (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment | $ 704,905 | $ 704,905 | $ 692,282
Less: accumulated depreciation | (256,696) | (256,696) | (227,470)
Property, plant and equipment, net | 448,209 | 448,209 | $ 464,812
Depreciation expense | 10,156 | 30,862 |
Pipelines and transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment | 589,729 | 589,729 |
Less: accumulated depreciation | (199,867) | (199,867) |
Property, plant and equipment, net | 389,862 | 389,862 |
Depreciation expense | 8,056 | 24,918 |
Wholesale marketing and terminalling |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment | 115,176 | 115,176 |
Less: accumulated depreciation | (56,829) | (56,829) |
Property, plant and equipment, net | 58,347 | 58,347 |
Depreciation expense | $ 2,100 | $ 5,944 |

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