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Long-term debt - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 23, 2013
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | $ 479,535 | $ 702,181 |
Current portion of long-term debt | (25,008) | (302,630) |
Long-term debt | 454,527 | 399,551 |
Convertible senior subordinated notes: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 | 277,650 |
Revolving credit facility: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 395,822 | 344,149 |
Fekola Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 57,242 | 50,569 |
Otjikoto equipment loan facility (net of unamortized transaction costs) |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 10,816 | 20,750 |
Masbate Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 13,071 | 7,719 |
Finance lease obligations |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 2,186 | 0 |
Nicaraguan equipment loans |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 398 | 1,344 |
Equipment loans/finance lease obligations: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 83,713 | 80,382 |
Principal | Convertible senior subordinated notes: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 | 258,750 | $ 259,000
Principal | Revolving credit facility: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 400,000 | 350,000 |
Principal | Fekola Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 58,634 |  |
Principal | Otjikoto equipment loan facility (net of unamortized transaction costs) |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 10,922 |  |
Principal | Masbate Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 13,526 |  |
Principal | Finance lease obligations |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 2,186 |  |
Principal | Nicaraguan equipment loans |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 398 |  |
Fair value adjustment | Convertible senior subordinated notes: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 | 18,900 |
Unamortized Transaction Costs | Revolving credit facility: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | $ (4,178) | $ (5,851) |

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