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Revenue (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue |  |
Total net sales | $ 626,969 | $ 536,377
Contract with customer, assets | 26,692 | 25,320
Contract with customer, liability | 1,505 | $ 1,420
Contract assets transferred to receivables | 18,941 |
Revenue recognized from contract liability | 1,141 |
Cash proceeds from liability contract | $ 1,447 |
Over time |  |
Disaggregation of Revenue |  |
Customer revenue transferred (percentage) | 26.00% | 24.90%
Total net sales | $ 163,253 | $ 133,338
Over time | Performance Based |  |
Disaggregation of Revenue |  |
Total net sales | 121,919 | 90,413
Over time | Delivery Based |  |
Disaggregation of Revenue |  |
Total net sales | $ 41,334 | $ 42,925
Point in time |  |
Disaggregation of Revenue |  |
Customer revenue transferred (percentage) | 74.00% | 75.10%
Total net sales | $ 463,716 | $ 403,039

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