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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Components of inventory    
Raw materials and parts $ 158,541 $ 132,041
Work-in-progress 73,105 55,688
Finished goods 149,811 109,882
Total Inventory, Net $ 381,457 $ 297,611