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Financial Instruments and Risk Management - Foreign Currency Risk, Interest Rate Risk, Interest Rate Swaps and Commodity Price Risk (Details) $ in Thousands | Dec. 31, 2021 CAD ($) usdPerBbl | Dec. 31, 2021 USD ($) usdPerBbl | Dec. 31, 2020 USD ($)
--- | --- | --- | ---
Currency risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Increase/decrease risk in foreign exchange rate | $ 0.01 |  |
Effect on net income | 2,300,000 |  |
Currency risk | U.S. dollar denominated, liabilities |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
U.S. dollar denominated |  | $ 829,934 | $ 934,731
Currency risk | U.S. dollar denominated, assets |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
U.S. dollar denominated |  | $ 602,503 | $ 759,508
Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Effect on net income | $ 5,100,000 |  |
Impact of base point change on interest rates | 100.00% | 100.00% |
Commodity price risk | Oil Price |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Potential impact of crude oil price changes | usdPerBbl | 1.00 | 1.00 |
Potential impact of natural gas price changes | $ 10,400,000 |  |
Commodity price risk | Natural Gas Price |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Potential impact of crude oil price changes | usdPerBbl | 0.25 | 0.25 |
Potential impact of natural gas price changes | $ 3,700,000 |  |

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