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Fair Value Measurements (Narrative) (Details) $ in Thousands, lb in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) derivative_instrument lb $ / lb | Mar. 31, 2019 lb $ / lb | Jun. 30, 2019 USD ($) derivative_instrument | Dec. 31, 2018 USD ($) derivative_instrument | Jun. 30, 2018 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 |  |  | 13.00% |  |
Derivative, number of instruments held | derivative_instrument | 6 |  | 6 | 5 |
Underlying, derivative mass | $ / lb | 0.37 | 0.39 |  |  |
Derivative, nonmonetary notional amount, mass | lb | 38.8 | 34.4 |  |  |
Derivative liability | $ 2,519 |  | $ 2,519 | $ 1,108 | $ 2,500
Derivative liability, current |  |  |  | 900 |
Derivative liability, noncurrent |  |  |  | $ 200 |

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