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Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Raw materials and construction materials | $ 37,088 | $ 42,240
Work in process | 11,124 | 11,098
Inventories | $ 48,212 | $ 53,338

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