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Credit Facilities - Bank Loan (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Secured bank loans received | $ 649,221 |  | $ 505,412 |
Bank loan - U.S. dollar denominated |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Secured bank loans received | 140,815 |  | 206,144 |
Credit facilities - Canadian dollar denominated |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Secured bank loans received | 510,358 |  | 300,327 |
Principal |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Secured bank loans received | 651,173 |  | 506,471 |
Changes in reported amount of U.S. denominated debt | 23,600 |  |  |
Principal | Bank loan - U.S. dollar denominated |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Secured bank loans received |  | $ 110.4 |  | $ 159.0
Changes in reported amount of U.S. denominated debt | 300 |  |  |
Principal | Credit facilities - Canadian dollar denominated |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Net draws | 145,000 |  |  |
Unamortized debt issuance costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Secured bank loans received | $ (1,952) |  | $ (1,059) |

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