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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenues $ 45,105 $ 37,644
Goods transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenues 21,378 20,284
Services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenues $ 23,727 $ 17,360