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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Total $ 349,006 $ 379,150 $ 1,096,008 $ 1,096,393
High Power Continuous Wave ("CW") Lasers        
Disaggregation of Revenue [Line Items]        
Total 152,767 177,787 483,455 538,013
Medium Power CW Lasers        
Disaggregation of Revenue [Line Items]        
Total 20,639 24,520 63,230 58,579
Pulsed Lasers        
Disaggregation of Revenue [Line Items]        
Total 55,216 59,051 192,000 176,219
Quasi-Continuous Wave ("QCW") Lasers        
Disaggregation of Revenue [Line Items]        
Total 11,353 16,312 38,212 45,503
Laser and Non-Laser Systems        
Disaggregation of Revenue [Line Items]        
Total 35,930 32,523 108,970 89,236
Other Revenue including Amplifiers, Service, Parts, Accessories and Change in Deferred Revenue        
Disaggregation of Revenue [Line Items]        
Total $ 73,101 $ 68,957 $ 210,141 $ 188,843