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Cash and Cash Equivalents (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial assets [line items] |  |
Annual interest rate for deposits | 1.50% |
Bottom of range [Member] |  |
Disclosure of financial assets [line items] |  |
Annual interest rate for deposits |  | 0.75%
Top of range [member] |  |
Disclosure of financial assets [line items] |  |
Annual interest rate for deposits |  | 1.25%

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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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