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Fair Value Measurements (Narrative) (Details) $ in Thousands, lb in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) lb $ / lb | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
Fair Value Disclosures [Abstract] |  |  |
Number of years long-term sales growth forecasted over | 6 years |  |
Average long-term sales growth forecast, over next 4 years, percent per year | 14.00% |  |
Combined carrying value | $ 304,144 | $ 228,950 | $ 210,304
Derivative, Nonmonetary Notional Amount, Mass | lb | 3.0 |  |
Underlying, Derivative Mass | $ / lb | 0.25 |  |
Derivative Asset | $ 700 |  |
Loss on derivative | $ 300 |  |

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