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Exploration and Evaluation Assets
 12 Months Ended
Dec. 31, 2020
Exploration For And Evaluation Of Mineral Resources [Abstract]  
Exploration and Evaluation Assets EXPLORATION AND EVALUATION ASSETS
December 31, 2020December 31, 2019
Balance, beginning of year$320,210 $358,935 
Capital expenditures4,490 2,948 
Property acquisitions— 1,523 
Divestitures— (443)
Impairment(113,058)(7,822)
Property swaps468 417 
Exploration and evaluation expense(14,011)(11,764)
Transfers to oil and gas properties (note 6)(8,585)(16,204)
Foreign currency translation2,351 (7,380)
Balance, end of year$191,865 $320,210 

At March 31, 2020, the Company identified indicators of impairment for the exploration and evaluation assets within each of its six CGUs. The estimated recoverable amount was below the carrying value of the exploration and evaluation assets in the Conventional, Peace River, Lloydminster, Viking and Eagle Ford CGUs and an impairment of $127.9 million was recorded as at March 31, 2020. The recoverable amount of each CGU was based on its FVLCD and was estimated with reference to arm's length transaction in comparable locations and the discounted cash flows associated with the Company's future development plans. The following table indicates the impairment 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 

At December 31, 2020, the Company estimated the recoverable amount of the exploration and evaluation assets within each of its six CGUs due to the ongoing volatility in future oil and natural gas prices. The recoverable amount supported the carrying amount for the Conventional, Peace River, Lloydminster, and Duvernay CGUs and no impairment or impairment reversal was recorded. The recoverable amount for the Viking and Eagle Ford CGUs exceeded their carrying amounts which resulted in an impairment reversal of $14.8 million at December 31, 2020. The recoverable amount of each CGU was based on its FVLCD and was estimated with reference to arm's length transaction in comparable locations and the discounted cash flows associated with the Company's future development plans. 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 

At December 31, 2019 the Company identified indicators of impairment for the exploration and evaluation assets within the Peace River CGU. The estimated recoverable amount was below the carrying value of the exploration and evaluation assets in the Peace River CGU and an impairment $7.8 million was recorded as at December 31, 2019. There were no indicators of impairment for exploration and evaluation assets in the remaining CGUs at December 31, 2019.