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Management of Financial Risk (Schedule of Company's Maximum Exposure to Credit Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents $ 131,898 $ 83,404 $ 90,503
Marketable securities 659 1,069  
Accounts receivable and other assets 76,555 47,707  
Other non-current receivables 15,210 40,744  
Credit risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents 131,898 83,404  
Accounts receivable and other assets 76,555 47,707  
Income tax receivable   2,553  
Other non-current receivables 5,495 40,744  
Total financial assets $ 213,948 $ 174,408