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Revenue From Contracts With Customers (Disaggregation of Revenue, By Product) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Total $ 318,441 $ 329,138 $ 864,094 $ 1,007,954
High Power Continuous Wave ("CW") Lasers        
Disaggregation of Revenue [Line Items]        
Total 184,387 184,924 461,181 577,354
Medium Power CW Lasers        
Disaggregation of Revenue [Line Items]        
Total 11,756 11,891 33,701 42,904
Pulsed Lasers        
Disaggregation of Revenue [Line Items]        
Total 34,975 33,850 109,391 106,100
Quasi-Continuous Wave ("QCW") Lasers        
Disaggregation of Revenue [Line Items]        
Total 15,079 12,479 38,660 42,612
Laser and Non-Laser Systems        
Disaggregation of Revenue [Line Items]        
Total 20,841 32,929 64,417 104,943
Other Revenue including Amplifiers, Service, Parts, Accessories and Change in Deferred Revenue        
Disaggregation of Revenue [Line Items]        
Total $ 51,403 $ 53,065 $ 156,744 $ 134,041