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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Components of inventory    
Raw materials and parts $ 101,655 $ 97,969
Work-in-progress 42,184 34,973
Finished goods 81,703 71,589
Total Inventory, Net $ 225,542 $ 204,531