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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 95,031 | $ 86,333 | $ 271,239 | $ 259,255
Distillery products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 78,336 | 72,335 | 225,365 | 216,984
Distillery products | Products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 74,999 | 69,569 | 216,226 | 209,024
Distillery products | Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,337 | 2,766 | 9,139 | 7,960
Ingredient solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 16,695 | 13,998 | 45,874 | 42,271
Ingredient solutions | Products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 16,695 | 13,998 | 45,874 | 42,271
Food grade alcohol | Distillery products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 67,525 | 63,251 | 192,435 | 189,643
Premium beverage alcohol | Distillery products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 46,864 | 43,941 | 133,135 | 131,868
Industrial alcohol | Distillery products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 20,661 | 19,310 | 59,300 | 57,775
Fuel grade alcohol | Distillery products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,576 | 1,458 | 5,006 | 4,867
Distillers feed and related co-products | Distillery products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 5,898 | 4,860 | 18,785 | 14,514
Warehouse services | Distillery products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,337 | 2,766 | 9,139 | 7,960
Specialty wheat starches | Ingredient solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 7,030 | 7,008 | 21,170 | 20,826
Specialty wheat proteins | Ingredient solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 5,486 | 4,939 | 16,230 | 14,541
Commodity wheat starch | Ingredient solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,793 | 1,948 | 6,926 | 6,302
Commodity wheat protein | Ingredient solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,386 | $ 103 | $ 1,548 | $ 602

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