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Inventories (Schedule of Inventory Current) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Inventories [Abstract] |  |
Work in process | $ 56,687 | $ 60,112
Parts inventory | 5,101 | 4,450
Total inventories, net | $ 61,788 | $ 64,562

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