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Plateau Acquisition - Narrative (Details) - USD ($) $ in Thousands | Oct. 02, 2019 | Mar. 31, 2020 | Dec. 31, 2019
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Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 191,892 | $ 191,892
Plateau Excavation |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration | $ 427,659 |  |
Goodwill | $ 106,661 |  |

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