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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Components of inventory    
Raw materials and parts $ 119,148 $ 100,408
Work-in-progress 50,212 41,454
Finished goods 94,167 80,185
Total Inventory, Net $ 263,527 $ 222,047