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Product Warranties (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Product Warranty Liability [Line Items]    
Accrued warranty reported in accrued expenses and other liabilities $ 16,974 $ 15,711
Accrued warranty reported in other long-term liabilities $ 18,999 $ 18,267
Minimum    
Product Warranty Liability [Line Items]    
Service warranties on lasers and amplifiers 1 year  
Maximum    
Product Warranty Liability [Line Items]    
Service warranties on lasers and amplifiers 3 years