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Long-term debt - Credit facility narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 CAD ($) covenant | Dec. 31, 2023 AUD ($) | Oct. 03, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |
Financing costs | $ 6,336,000 |  |  | $ 6,336,000
Credit facility | Financial Guarantee | Mikisew North American Limited Partnership ("MNALP") |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity of credit facility | 110,000,000 |  |  |
Revolver | Credit facility | Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity of credit facility | 478,000,000 |  |  |
Finance lease borrowing limit |  |  | $ 350,000,000 |
Other outstanding debt limit |  |  | $ 20,000,000 |
Financing costs | 5,800,000 |  |  |
Amount outstanding during period | 31,300,000 |  |  | 32,000,000
Unused borrowing availability under the revolving facility | 129,300,000 |  |  | 88,000,000
Unused borrowing availability under finance lease obligations | $ 60,100,000 |  |  | $ 46,600,000
Number of financial covenants | covenant | 2 |  |  |
Total debt to bank EBITDA ratio | 3.5 | 3.5 |  |
Fixed charge ratio | 1.1 | 1.1 |  |
Revolver | Credit facility | Credit Facility | Canadian dollar |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity of credit facility | $ 280,000,000 |  |  |
Revolver | Credit facility | Credit Facility | Australian dollar |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity of credit facility |  | $ 220,000,000 |  |
Revolver | Credit facility | Credit Facility | Financial Guarantee |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facilities | $ 74,700,000 |  |  |
Revolver | Credit facility | Credit Facility | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Standby fees percentage | 0.40% |  |  |
Revolver | Credit facility | Credit Facility | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Standby fees percentage | 0.70% |  |  |

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- Definition Line of Credit Facility, Finance Lease, Maximum Borrowing Capacity + References No definition available. + Details
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- Definition Line of Credit Facility, Finance Lease, Remaining Borrowing Capacity + References No definition available. + Details
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- Definition Line of Credit Facility, Allowable Other Debt Outstanding Limit + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-3 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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