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Financial Instruments and Risk Management - Liquidity Risk (Details) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Mar. 05, 2020 CAD ($) | Feb. 20, 2020 CAD ($) | Feb. 20, 2020 USD ($) | Feb. 05, 2020 USD ($) | Dec. 31, 2019 CAD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Undrawn borrowing facilities | $ 367,200,000 |  |  |  |  |  |
Financial derivatives | 26,792,000 |  |  |  |  |  | $ 8,668,000
Trade and other payables | 155,955,000 |  |  |  |  |  | 207,454,000
Credit facilities | 649,221,000 |  |  |  |  |  | 505,412,000
Long-term notes | 1,132,868,000 |  |  |  |  |  | 1,328,175,000
Lease obligations | 11,850,000 |  |  |  |  |  | 14,568,000
Notional amount | $ 664,700,000 |  |  |  |  |  |
8.75% Notes Due April 1, 2027 |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Notional amount |  | $ 500,000,000 |  |  |  | $ 500,000,000 |
8.75% Notes Due April 1, 2027 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings, interest rate | 8.75% | 8.75% |  |  |  | 8.75% |
5.125% notes due June 1, 2021 |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Notional amount |  | $ 400,000,000 |  | $ 530,400,000 | $ 400,000,000 |  |
5.125% notes due June 1, 2021 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings, interest rate | 5.125% | 5.125% |  | 5.125% | 5.125% |  |
6.625% notes due July 19, 2022 |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Notional amount | $ 300,000,000 |  | $ 300,000,000 |  |  |  |
6.625% notes due July 19, 2022 | Fixed interest rate |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Borrowings, interest rate | 6.625% | 6.625% | 6.625% |  |  |  |
Liquidity risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Undrawn borrowing facilities | $ 367,200,000 |  |  |  |  |  | 523,800,000
Trade and other payables | 155,955,000 |  |  |  |  |  |
Credit facilities | 651,173,000 |  |  |  |  |  |
Long-term notes | 1,147,950,000 |  |  |  |  |  |
Interest on long-term notes | 446,854,000 |  |  |  |  |  |
Lease obligations | 11,850,000 |  |  |  |  |  |
Financial liabilities | 2,440,574,000 |  |  |  |  |  |
Less than 1 year |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Lease obligations | 4,504,000 |  |  |  |  |  | 6,216,000
Less than 1 year | Liquidity risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Financial derivatives | 26,792,000 |  |  |  |  |  |
Trade and other payables | 155,955,000 |  |  |  |  |  |
Credit facilities | 0 |  |  |  |  |  |
Long-term notes | 0 |  |  |  |  |  |
Interest on long-term notes | 84,502,000 |  |  |  |  |  |
Lease obligations | 4,504,000 |  |  |  |  |  |
Financial liabilities | 271,753,000 |  |  |  |  |  |
1-3 years |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Lease obligations | 4,302,000 |  |  |  |  |  | 7,748,000
1-3 years | Liquidity risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Financial derivatives | 0 |  |  |  |  |  |
Trade and other payables | 0 |  |  |  |  |  |
Credit facilities | 0 |  |  |  |  |  |
Long-term notes | 0 |  |  |  |  |  |
Interest on long-term notes | 169,004,000 |  |  |  |  |  |
Lease obligations | 4,302,000 |  |  |  |  |  |
Financial liabilities | 173,306,000 |  |  |  |  |  |
3-5 years |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Lease obligations | 3,044,000 |  |  |  |  |  | 604,000
3-5 years | Liquidity risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Financial derivatives | 0 |  |  |  |  |  |
Trade and other payables | 0 |  |  |  |  |  |
Credit facilities | 651,173,000 |  |  |  |  |  |
Long-term notes | 510,200,000 |  |  |  |  |  |
Interest on long-term notes | 123,479,000 |  |  |  |  |  |
Lease obligations | 3,044,000 |  |  |  |  |  |
Financial liabilities | 1,287,896,000 |  |  |  |  |  |
Beyond 5 years |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Lease obligations | 0 |  |  |  |  |  | $ 0
Beyond 5 years | Liquidity risk |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Financial derivatives | 0 |  |  |  |  |  |
Trade and other payables | 0 |  |  |  |  |  |
Credit facilities | 0 |  |  |  |  |  |
Long-term notes | 637,750,000 |  |  |  |  |  |
Interest on long-term notes | 69,869,000 |  |  |  |  |  |
Lease obligations | 0 |  |  |  |  |  |
Financial liabilities | $ 707,619,000 |  |  |  |  |  |

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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 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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