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Financial instruments - related risk management (Details) - CAD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | $ 1,662,233 | $ 1,109,485 |
Financial liabilities | (1,781,812) | (1,815,869) |
Gain (loss) on derivatives | (81,081) | 56,250 |
Finance income | 22,071 | 5,265 |
Disclosure of credit risk exposure [abstract] |  |  |
Cash and cash equivalents | 711,528 | 591,620 | $ 320,278
Short-term investments | 391,025 | 0 |
Advances receivable from JV Inkai LLP | 124,533 | 58,820 |
Derivative assets | $ 3,881 | 40,804 |
Currency risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage increase or decrease in CAD$ | 5.00% |  |
Currency risk [member] | Cash and cash equivalents [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain (loss), foreign exchange | $ 5,273 |  |
Currency risk [member] | Cash and cash equivalents [member] | USD [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 105,463 |  |
Currency risk [member] | Accounts receivable [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain (loss), foreign exchange | 17,945 |  |
Currency risk [member] | Accounts receivable [Member] | USD [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 358,904 |  |
Currency risk [member] | Long-term receivables, investments and other [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain (loss), foreign exchange | 6,227 |  |
Currency risk [member] | Long-term receivables, investments and other [Member] | USD [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets | 124,533 |  |
Currency risk [member] | Accounts Payable and Accrued Liabilities [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain (loss), foreign exchange | (2,274) |  |
Currency risk [member] | Accounts Payable and Accrued Liabilities [Member] | USD [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | 45,474 |  |
Currency risk [member] | Net foreign currency derivatives [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain (loss), foreign exchange | (48,923) |  |
Currency risk [member] | Net foreign currency derivatives [Member] | USD [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities | $ 52,665 |  |
Interest rate risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage increase or decrease in the interest rate | 1.00% |  |
Interest rate risk [member] | Interest rate contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain (loss) on derivatives | $ (4,173) |  |
Interest rate risk [member] | Advances receivable from Inkai [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Finance income | 1,179 |  |
Credit risk [member] |  |  |
Disclosure of credit risk exposure [abstract] |  |  |
Cash and cash equivalents | 711,528 | 591,620 |
Short-term investments | 391,025 | 0 |
Accounts receivable | 398,639 | 393,213 |
Advances receivable from JV Inkai LLP | 124,533 | 58,820 |
Derivative assets | $ 3,881 | $ 40,804 |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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