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Long-Term Debt, Net - Firment Trading Limited and Silaner Investments Limited (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 10, 2017 | Feb. 08, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Repayments of borrowings |  |  | $ 4,399 | $ 3,100 | $ 45,506 |  |
Long-term borrowings |  |  | 41,538 | 65,572 |  |  |
Credit Facility, Remaining borrowing capacity |  |  | 3,000 | 2,565 |  |  |
Proceeds from borrowings |  |  | $ 280 | 5,950 | 39,505 |  |
Firment Trading Limited |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Loan Facility, Maximum borrowing capacity |  |  |  |  | 20,000 | $ 8,000 | $ 4,000
Line Of Credit Facility Drawndown Amounts Multiples |  |  |  |  | $ 100 |  |
Repayments of borrowings | $ 1,639 |  |  |  |  |  |
Long-term borrowings |  | $ 18,524 |  | $ 17,435 |  |  |
Borrowings, maturity |  |  | April 12, 2017 |  |  |  |
Credit Facility, Decrease, Forgiveness |  | $ 16,885 |  |  |  |  |
Shares issued during period |  | 16,885,000 |  |  |  |  |
Number of shares called by warrants |  | 6,230,580 |  |  |  |  |
Warrants exercise price |  | $ 1.60 |  |  |  |  |
Interest rate |  |  |  | 5.00% |  |  |
Credit Facility, Remaining borrowing capacity |  |  |  | $ 2,565 |  |  |
Silaner Investments Limited |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Loan Facility, Maximum borrowing capacity |  |  |  | 3,000 |  |  |
Line Of Credit Facility Drawndown Amounts Multiples |  |  |  | 100 |  |  |
Repayments of borrowings | $ 74 |  | $ 280 |  |  |  |
Long-term borrowings |  |  | $ 0 | $ 3,115 |  |  |
Borrowings, maturity |  |  | January 12, 2018 |  |  |  |
Credit Facility, Decrease, Forgiveness |  | $ 3,115 |  |  |  |  |
Shares issued during period |  | 3,115,000 |  |  |  |  |
Number of shares called by warrants |  | 1,149,437 |  |  |  |  |
Warrants exercise price |  | $ 1.60 |  |  |  |  |
Interest rate |  |  |  | 5.00% |  |  |
Proceeds from borrowings |  |  | $ 280 |  |  |  |
Weighted average |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Interest rate |  |  | 3.80% | 3.52% |  |  |

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