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Bank Loan (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Jan. 26, 2018 | Apr. 30, 2015 | Jun. 30, 2014
Disclosure of detailed information about borrowings [line items] |  |  |  |
Maximum debt to EBITDA ratio | 3.00% |  |  |
Term Credit Facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  |  | $ 60,000 |
Borrowings, maturity | April 1, 2019 |  |  |
Secured bank loans received |  |  | $ 40,000 |
Borrowings, interest rate basis | Interest on the Credit Facility is calculated using the one, two, three, or six month US$ LIBOR rates plus a graduated margin based on the Company's leverage ratio, as defined in the Credit Facility. Interest is payable one month in arrears. |  |  |
Term Credit Facility [member] | Entering into significant commitments or contingent liabilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 40,000 |  |
Revolving Credit Facillity [member] | Entering into significant commitments or contingent liabilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 80,000 |  |
Tangible Net Worth [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Minimum tangible net worth percentage |  |  |  | 85.00%
Positive Quarterly Net Income [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Minimum tangible net worth percentage |  |  |  | 50.00%
Value of any Equity Interests Issued [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Minimum tangible net worth percentage |  |  |  | 50.00%

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- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of loans received from banks that have been secured by collateral. [Refer: Loans received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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