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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Components of inventory |  |
Raw materials and parts | $ 133,634 | $ 129,294
Work-in-progress | 49,583 | 43,202
Finished goods | 108,893 | 101,789
Total Inventory, Net | $ 292,110 | $ 274,285

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