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Inventories (Inventories) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Raw materials and construction materials | $ 29,829 | $ 30,006
Work in process | 8,892 | 12,315
Inventories | $ 38,721 | $ 42,321

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