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Acquisitions - Van Hook Crude Acquisition Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Mar. 15, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Total assets acquired | $ 312,079 | $ 291,205 | $ 15,549
Machinery, equipment and tooling |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired | 16,863 | 14,858 | 1,478
Plant and buildings |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired | 160,736 | 158,882 | 1,407
Railroad and sidings |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired | $ 27,347 | $ 27,347 | 9,926
Land improvements |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired |  |  | $ 2,738

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