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Exploration and Evaluation Assets (Tables)
 12 Months Ended
Dec. 31, 2021
Exploration For And Evaluation Of Mineral Resources [Abstract]  
Exploration and evaluation assets
December 31, 2021December 31, 2020
Balance, beginning of year$191,865 $320,210 
Capital expenditures3,298 4,490 
Property acquisitions1,100 — 
Divestitures(166)— 
Property swaps408 468 
Impairment— (113,058)
Exploration and evaluation expense (1)
(15,212)(14,011)
Transfers to oil and gas properties (note 6)(7,727)(8,585)
Foreign currency translation(742)2,351 
Balance, end of year$172,824 $191,865 
(1)Exploration and evaluation expense balance consists of land expiries as at December 31, 2021.
Impairment of cash generating units The following table indicates the impairment loss booked for each CGU at March 31, 2020.
Impairment at
March 31, 2020
Conventional CGU$4,000 
Peace River CGU20,000 
Lloydminster CGU42,000 
Viking CGU13,000 
Eagle Ford CGU48,861 
$127,861 
Schedule of impairment and impairment reversal The following table indicates the impairment reversal booked for the Viking and Eagle Ford CGUs at December 31, 2020.
Impairment reversal at December 31, 2020
Viking CGU$2,000 
Eagle Ford CGU12,803 
$14,803