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Management of Financial Risk (Schedule of Company's Maximum Exposure to Credit Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents $ 83,404 $ 90,503 $ 183,074
Short term investments   72,824  
Accounts receivable and other assets 47,707 32,769  
Other non-current receivables 38,389 15,241  
Credit risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents 83,404 90,503  
Short term investments   72,824  
Derivative assets   2,646  
Accounts receivable and other assets 47,707 32,769  
Income tax receivable 2,553 136  
Other non-current receivables 38,389 15,241  
Total financial assets $ 172,053 $ 214,119