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Fair Value Measurements (Narrative) (Details) $ in Thousands, lb in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) property lb $ / lb | Jun. 30, 2016 USD ($) property | Dec. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
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 | $ 203,204 | $ 151,250 | $ 172,748
Derivative, Nonmonetary Notional Amount, Mass | lb | 26.4 |  |
Underlying, Derivative Mass | $ / lb | 0.25 |  |
Derivative Asset | $ 1,900 |  |
Derivative, Gain (Loss) on Derivative, Net | $ 400 |  |
Vacant owned facilities |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Number of vacant owned facilities | property | 1 | 1 |
Number of properties classified as fixed assets | property | 1 | 1 |
Estimated combined fair value | $ 3,000 | $ 3,000 |
Combined carrying value | $ 2,500 | $ 2,500 |

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