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Revenue (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]          
Revenue remaining performance obligation $ 209,324   $ 209,324    
Disaggregation of Revenue          
Total net sales 200,933 $ 172,890 351,402 $ 295,344  
Contract with customer, assets 37,457   37,457   $ 26,692
Contract with customer, liability 2,162   2,162   $ 1,505
Contract assets transferred to receivables     19,764    
Cash proceeds from liability contract     2,016    
Revenue recognized from contract liability $ 318 $ 339 $ 1,266 $ 740  
Over time          
Disaggregation of Revenue          
Customer revenue transferred over-time (percentage) 24.20% 23.40% 25.70% 24.30%  
Total net sales $ 48,595 $ 40,476 $ 90,343 $ 71,698  
Over time | Performance Based          
Disaggregation of Revenue          
Total net sales 34,984 29,583 66,821 54,144  
Over time | Delivery Based          
Disaggregation of Revenue          
Total net sales $ 13,611 $ 10,893 $ 23,522 $ 17,554  
Point in time          
Disaggregation of Revenue          
Customer revenue transferred over-time (percentage) 75.80% 76.60% 74.30% 75.70%  
Total net sales $ 152,338 $ 132,414 $ 261,059 $ 223,646  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction          
Revenue remaining performance obligation (percentage) 11.20%   11.20%    
Performance obligations expected to be satisfied, expected timing 12 months   12 months