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v3.8.0.1

Restricted Cash, Deposits and Marketable Securities (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial assets [line items] |  |
Bonds coupon rate | 4.435% | 3.389%
Bonds Maturity date | Dec. 30, 2020 | Dec. 30, 2018
Bonds rating | Baa3 | Baa3
Annual interest rate | 1.50% |
Bottom of range [Member] |  |
Disclosure of financial assets [line items] |  |
Annual interest rate |  | 0.75%
Top of range [member] |  |
Disclosure of financial assets [line items] |  |
Annual interest rate |  | 1.25%
Forward contract [Member] | Bottom of range [Member] |  |
Disclosure of financial assets [line items] |  |
Annual interest rate |  | 0.35%
Forward contract [Member] | Top of range [member] |  |
Disclosure of financial assets [line items] |  |
Annual interest rate |  | 0.40%
WACHOVIA [Member] |  |
Disclosure of financial assets [line items] |  |
Annual interest rate | 5.80% |

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