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Management of Financial Risk (Schedule of Company's Maximum Exposure to Credit Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents $ 107,097 $ 131,898 $ 83,404
Marketable securities   659  
Derivative assets 129    
Accounts receivable and other assets 76,487 76,555  
Other non-current receivables 26,430 16,144  
Credit risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents 107,097 131,898  
Derivative assets 1,619    
Accounts receivable and other assets 76,487 76,555  
Income tax receivable 1,713    
Other non-current receivables 5,903 6,429  
Total financial assets $ 192,819 $ 214,882