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Revenue From Contracts With Customers (Disaggregation of Revenue, By Product) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total $ 345,585 $ 249,242
High Power Continuous Wave ("CW") Lasers    
Disaggregation of Revenue [Line Items]    
Total 170,482 119,316
Medium Power CW Lasers    
Disaggregation of Revenue [Line Items]    
Total 15,882 11,253
Pulsed Lasers    
Disaggregation of Revenue [Line Items]    
Total 55,395 31,839
Quasi-Continuous Wave ("QCW") Lasers    
Disaggregation of Revenue [Line Items]    
Total 13,666 9,873
Laser and Non-Laser Systems    
Disaggregation of Revenue [Line Items]    
Total 27,116 18,634
Other Revenue including Amplifiers, Service, Parts, Accessories and Change in Deferred Revenue    
Disaggregation of Revenue [Line Items]    
Total $ 63,044 $ 58,327