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Accounting Policies - Cash and Cash Equivalents and Temporary Investments (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
U.S. dollar |  |
Cash and Cash Equivalents and Temporary Investments |  |
Average yield for cash equivalents and temporary investments | 0.87% | 0.36%
Mexican peso |  |
Cash and Cash Equivalents and Temporary Investments |  |
Average yield for cash equivalents and temporary investments | 6.72% | 4.06%

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