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Financial risk management - Summary of Exposure to Various Currencies Denominated in Foreign Currency (Details) ₺ in Thousands, € in Thousands, дин in Thousands, ¥ in Thousands, £ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 RON ( ) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 TRY (₺) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 BBD ($) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2019 AUD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 RSD (дин) | Dec. 31, 2018 RON ( ) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 TRY (₺) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 AUD ($) | Dec. 31, 2017 USD ($)
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 177,742 |  |  |  |  |  |  |  |  |  |  | $ 286,312 |  |  |  |  |  |  |  |  |  | $ 479,501
Marketable securities | 3,828 |  |  |  |  |  |  |  |  |  |  | 2,572 |  |  |  |  |  |  |  |  |  |
Accounts receivable and other | 75,290 |  |  |  |  |  |  |  |  |  | $ 80,434 | 80,987 |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | (139,104) |  |  |  |  |  |  |  |  |  |  | (137,900) |  |  |  |  |  |  |  |  |  |
Canadian dollar | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 10,204 |  |  |  |  |  |  |  |  |  |  | $ 19,030 |  |  |  |  |  |  |  |  |
Marketable securities |  | 4,971 |  |  |  |  |  |  |  |  |  |  | 3,509 |  |  |  |  |  |  |  |  |
Accounts receivable and other |  | 13,010 |  |  |  |  |  |  |  |  |  |  | 23,672 |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities |  | (59,583) |  |  |  |  |  |  |  |  |  |  | (102,027) |  |  |  |  |  |  |  |  |
Other non-current liability |  | (1,520) |  |  |  |  |  |  |  |  |  |  | (10,064) |  |  |  |  |  |  |  |  |
Net assets | (25,259) | $ (32,918) |  |  |  |  |  |  |  |  |  | (48,292) | $ (65,880) |  |  |  |  |  |  |  |  |
Australian dollar | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  | $ 435 |  |  |  |  |  |  |  |  |  |  | $ 433 |
Accounts receivable and other |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  | 3 |
Accounts payable and accrued liabilities |  |  |  |  |  |  |  |  |  | (8) |  |  |  |  |  |  |  |  |  |  | (7) |
Net assets | 302 |  |  |  |  |  |  |  |  | $ 430 |  | 302 |  |  |  |  |  |  |  |  | $ 429 |
Euro | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | € |  |  | € 10,692 |  |  |  |  |  |  |  |  |  |  | € 6,861 |  |  |  |  |  |  |  |
Accounts receivable and other | € |  |  | 8,631 |  |  |  |  |  |  |  |  |  |  | 15,552 |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | € |  |  | (47,361) |  |  |  |  |  |  |  |  |  |  | (34,488) |  |  |  |  |  |  |  |
Other non-current liability | € |  |  | (11,497) |  |  |  |  |  |  |  |  |  |  | (9,191) |  |  |  |  |  |  |  |
Net assets | (44,213) |  | € (39,535) |  |  |  |  |  |  |  |  | (24,334) |  | € (21,266) |  |  |  |  |  |  |  |
Turkish lira | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | ₺ |  |  |  |  |  | ₺ 9,930 |  |  |  |  |  |  |  |  |  |  |  | ₺ 2,664 |  |  |  |
Accounts receivable and other | ₺ |  |  |  |  |  | 8,923 |  |  |  |  |  |  |  |  |  |  |  | 54,772 |  |  |  |
Accounts payable and accrued liabilities | ₺ |  |  |  |  |  | (109,765) |  |  |  |  |  |  |  |  |  |  |  | (44,516) |  |  |  |
Other non-current liability | ₺ |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | (15,877) |  |  |  |
Net assets | (14,801) |  |  |  |  | ₺ (90,912) |  |  |  |  |  | (562) |  |  |  |  |  | ₺ (2,957) |  |  |  |
Chinese renminbi | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | ¥ |  |  |  |  |  |  | ¥ 60 |  |  |  |  |  |  |  |  |  |  |  | ¥ 72 |  |  |
Net assets | 9 |  |  |  |  |  | ¥ 60 |  |  |  |  | 11 |  |  |  |  |  |  | ¥ 72 |  |  |
Romanian lei | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | |  |  |  | 1,599 |  |  |  |  |  |  |  |  |  |  |  | 1,904 |  |  |  |  |  |
Accounts receivable and other | |  |  |  | 2,767 |  |  |  |  |  |  |  |  |  |  |  | 4,487 |  |  |  |  |  |
Accounts payable and accrued liabilities | |  |  |  | (1,421) |  |  |  |  |  |  |  |  |  |  |  | (2,286) |  |  |  |  |  |
Net assets | 690 |  |  | 2,945 |  |  |  |  |  |  |  | 1,010 |  |  |  | 4,105 |  |  |  |  |  |
British pound | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | £ |  |  |  |  | £ 371 |  |  |  |  |  |  |  |  |  |  |  | £ 923 |  |  |  |  |
Net assets | 491 |  |  |  | £ 371 |  |  |  |  |  |  | 1,180 |  |  |  |  | £ 923 |  |  |  |  |
Brazilian real | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | R$ |  |  |  |  |  |  |  |  | R$ 1,101 |  |  |  |  |  |  |  |  |  |  | R$ 4,539 |  |
Accounts receivable and other | R$ |  |  |  |  |  |  |  |  | 6,356 |  |  |  |  |  |  |  |  |  |  | 9,970 |  |
Accounts payable and accrued liabilities | R$ |  |  |  |  |  |  |  |  | (1,639) |  |  |  |  |  |  |  |  |  |  | (2,941) |  |
Net assets | 1,447 |  |  |  |  |  |  |  | R$ 5,818 |  |  | 2,982 |  |  |  |  |  |  |  | R$ 11,568 |  |
Barbados bajan | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | $ 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets | $ 8 |  |  |  |  |  |  | $ 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Serbia, Dinars | Currency risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | дин |  |  |  |  |  |  |  |  |  |  |  |  |  |  | дин 8,848 |  |  |  |  |  |  |
Accounts receivable and other | дин |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,386 |  |  |  |  |  |  |
Accounts payable and accrued liabilities | дин |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,004) |  |  |  |  |  |  |
Net assets |  |  |  |  |  |  |  |  |  |  |  | $ 157 |  |  | дин 16,230 |  |  |  |  |  |  |

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