Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Components of inventory
Raw materials and parts	$ 101,759	$ 98,252
Work-in-progress	39,835	35,100
Finished goods	85,729	81,031
Total Inventory, Net	$ 227,323	$ 214,383