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Summary of Significant Accounting Policies - Estimated useful life of assets (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Buildings |  |
Property and Equipment |  |
Estimated useful life | 50 years | 50 years
Installations (in general) |  |
Property and Equipment |  |
Estimated useful life | 10 years | 10 years
Equipment |  |
Property and Equipment |  |
Estimated useful life | 5 years | 5 years
Office furniture |  |
Property and Equipment |  |
Estimated useful life | 5 years | 5 years
Maximum | Software or computer programs |  |
Property and Equipment |  |
Estimated useful life | 6 years |

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- Definition Represents the information pertaining to estimated useful life of the assets, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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