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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2024
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Asset Retirement Obligations ASSET RETIREMENT OBLIGATIONS
December 31, 2024December 31, 2023
Balance, beginning of year$623,399 $588,923 
Liabilities incurred (1)
32,635 24,185 
Liabilities settled(28,793)(26,416)
Liabilities assumed from corporate acquisition (note 4)— 31,310 
Liabilities acquired from property acquisitions814 87 
Liabilities divested(9,482)(43,153)
Accretion (note 16)21,226 20,406 
Government grants (2)
— (1,271)
Change in estimate (1)
10,113 17,067 
Changes in discount rates and inflation rates (1)(3)
(17,495)12,914 
Foreign currency translation8,534 (653)
Balance, end of year$640,951 $623,399 
Less current portion of asset retirement obligations15,656 20,448 
Non-current portion of asset retirement obligations$625,295 $602,951 
(1)The total of these items reflects the total change in asset retirement obligations of $25.3 million per Note 7 - Oil and Gas Properties ($54.2 million increase in 2023).
(2)Certain government grants were provided by the Government of Alberta and the Government of Saskatchewan under programs that were completed during the year ended December 31, 2023. During the year ended December 31, 2024, no amounts have been recognized under these programs ($1.3 million for the year ended December 31, 2023).
(3)The discount and inflation rates used to calculate the liability for our Canadian operations at December 31, 2024 were 3.3% and 1.8% respectively (December 31, 2023 - 3.0% and 1.6%). The discount and inflation rates used to calculate the liability for our U.S. operations at December 31, 2024 were 4.8% and 2.3%, respectively (December 31, 2023 - 4.0% and 2.1%).

At December 31, 2024, the undiscounted, uninflated amount of estimated cash flows required to settle the asset retirement obligations is $845.0 million (December 31, 2023 - $795.5 million). The discounted amount of estimated cash flow required to settle the asset retirement obligations at December 31, 2024 is $641.0 million (December 31, 2023 - $623.4 million). These costs are expected to be incurred over the next 55 years.