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Management of Financial Risk (Disclosure of Nature and Extent Arising from Financial Instruments - Commodity Price Risk) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
t
Feb. 11, 2021
t
$ / T
Dec. 31, 2020
$ / T
Dec. 31, 2020
gal
Dec. 31, 2020
$ / gal
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Increase (decrease) in sales due to price changes of commodity $ (2,800)          
Liquidity amount available 187,100          
Silver Commodity Type [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Effect on Sales $ 1,154          
Change percentage, commodity 10.00%          
Gold Commodity Type [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Effect on Sales $ 562          
Change percentage, commodity 10.00%          
Increase (decrease) in sales due to price changes of commodity   $ 3,300        
Lead Commodity [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Effect on Sales $ 343          
Change percentage, commodity 10.00%          
Aggregate quantity of zero cost collars | t     6,237      
Floor Price | $ / T     2,000      
Cap Price | $ / T     2,125      
Zinc Commodity [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Effect on Sales $ 318          
Change percentage, commodity 10.00%          
Aggregate quantity of zero cost collars | t   12,300        
Floor Price | $ / T       2,600    
Cap Price | $ / T       2,900    
Heating Oil Commodity [Member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Aggregate quantity of zero cost collars | gal         720,000  
Floor Price | $ / gal           1.40
Cap Price | $ / gal           1.6150
Heating Oil Commodity [Member] | Swap contract [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Aggregate forward- swap         720,000 1.52
Jet Fuel Commodity [Member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Aggregate quantity of zero cost collars | gal         1,680,000  
Floor Price | $ / gal           1.30
Cap Price | $ / gal           1.4775
Jet Fuel Commodity [Member] | Swap contract [member]            
Disclosure of nature and extent of risks arising from financial instruments [line items]            
Aggregate forward- swap         1,680,000 1.438