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Inventories - Components (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |  |  |  |  |
Raw materials | $ 79,902 |  | $ 68,842 |  |  |
Work in process | 2,275 |  | 1,825 |  |  |
Finished goods | 5,607 |  | 5,578 |  |  |
Total, gross | 87,784 |  | 76,245 |  |  |
Less: Allowance for excess and obsolete inventories | (2,373) | $ (2,365) | (2,644) | $ (2,350) | $ (1,567) | $ (1,210)
Total, net | $ 85,411 |  | $ 73,601 |  |  |

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