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Inventories (Components of Inventories) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Inventory Disclosure [Abstract] |  |  |
Raw materials | $ 49,624 | $ 37,660 |
Work in process | 2,969 | 3,906 |
Finished goods and parts | 80,568 | 62,337 |
Inventories, net | 133,161 | 103,903 |
Lower of cost or market adjustment | $ 0 | $ 12,883 | $ 11,053

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