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Impairment Testing (Narratives) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Notes to Consolidated Financial Statements [Abstract]  
As result of the loss of control of Allana-Afar the company deducted of $ 55
After-tax discount rate used in calculation of the recoverable amount of the operating segments (real) 6.00%
After-tax discount rate used in calculation of the recoverable amount of the operating segments (nominal) 8.00%
Long-term growth rate 0% - 2%