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Derivatives (Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | $ 5,448 | $ 13,325
Liability Derivatives Fair Value | 1,088 | 730
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | 3,064 | 4,235
Liability Derivatives Fair Value | 4 | 0
Designated as Hedging Instrument [Member] | Corn Option [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | 2,876 | 4,235
Designated as Hedging Instrument [Member] | Corn Option [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | 106 | 0
Designated as Hedging Instrument [Member] | Natural Gas Swap [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | 82 | 0
Designated as Hedging Instrument [Member] | Natural Gas Swap [Member] | Accrued Expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives Fair Value | 4 | 0
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | 2,384 | 9,090
Liability Derivatives Fair Value | 1,084 | 730
Not Designated as Hedging Instrument [Member] | Corn Option [Member] | Accrued Expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives Fair Value | 21 | 122
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | 1,153 | 8,939
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued Expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives Fair Value | 1,063 | 608
Not Designated as Hedging Instrument [Member] | Corn options and futures [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | 1,167 | 151
Not Designated as Hedging Instrument [Member] | Soybean Meal [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives Fair Value | $ 64 | $ 0

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