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Fair Value Measurements (Narrative) (Details) $ in Thousands, lb in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) property lb $ / lb | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) property
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Deferred Compensation, Percentage Of Funds Invested | 60.00% |  |
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% |  |
Derivative nonmonetary notional amount, mass | lb | 40.8 |  |
Underlying derivative mass | $ / lb | 0.25 |  |
Derivative asset | $ 2,300 |  |
Combined carrying value | $ 172,748 | $ 150,600 |
Vacant Owned Facilities |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Number of vacant owned properties | property | 1 | 3 | 4
Number properties classified as fixed assets | property | 1 | 1 | 3
Number of vacant owned facilities sold | property |  | 1 |
Number of vacant facilities reopened | property |  | 1 |
Estimated combined fair value | $ 3,000 |  |
Combined carrying value | $ 2,500 |  |
Vacant Owned Facilities Classified in Fixed Assets |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Estimated combined fair value |  | $ 3,000 | $ 4,200
Combined carrying value |  | $ 2,500 | $ 3,900

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