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Acquisitions - Van Hook Crude Acquisition Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 15, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Total assets acquired | $ 257,527 | $ 15,549 | $ 198,129
Machinery, equipment and tooling |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired | 11,791 | 1,478 | 7,802
Plant and buildings |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired | 143,622 | 1,407 | 81,561
Railroad and sidings |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired | $ 25,691 | 9,926 | $ 10,254
Land improvements |  |  |
Business Acquisition [Line Items] |  |  |
Total assets acquired |  | $ 2,738 |

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