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Contingencies Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Sales to Major Customers | The Company's sales to major customers (purchases of 10% or more of total sales before the effects of hedging) for the years ended December 31, 2017, 2016 and 2015 are as follows:
| December 31,
| 2017 |  | 2016 |  | 2015
Company A | 40 | % |  | 59 | % |  | 62 | %
Company B | 5 | % |  | 12 | % |  | 23 | %
Company C | 7 | % |  | 10 | % |  | 12 | %
All others | 48 | % |  | 19 | % |  | 3 | %

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