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Revenue (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Revenue remaining performance obligation $ 250,052    
Disaggregation of Revenue      
Total net sales 150,469 $ 122,454  
Contract with customer, assets 33,599   $ 26,692
Contract with customer, liability 3,720   $ 1,505
Contract assets transferred to receivables 11,406    
Revenue recognized from contract liability 948 $ 346  
Cash proceeds from liability contract $ 3,384    
Over time      
Disaggregation of Revenue      
Customer revenue transferred over-time (percentage) 27.70% 25.50%  
Total net sales $ 41,748 $ 31,222  
Over time | Performance Based      
Disaggregation of Revenue      
Total net sales 31,837 24,561  
Over time | Delivery Based      
Disaggregation of Revenue      
Total net sales $ 9,911 $ 6,661  
Point in time      
Disaggregation of Revenue      
Customer revenue transferred over-time (percentage) 72.30% 74.50%  
Total net sales $ 108,721 $ 91,232  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction      
Revenue remaining performance obligation (percentage) 3.10%    
Performance obligations expected to be satisfied, expected timing 12 months