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Supplemental Financial Information (Summary of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 51,628 $ 47,704
Work-in-process 39,873 32,316
Finished goods 123,092 103,469
Inventory, Net 214,593 183,489
Provision for obsolescence $ 13,700 $ 9,800