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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Components of inventory    
Raw materials and parts $ 109,599 $ 98,252
Work-in-progress 43,179 35,100
Finished goods 87,207 81,031
Total Inventory, Net $ 239,985 $ 214,383