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Management of Financial Risk (Schedule of Company's Maximum Exposure to Credit Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents $ 183,074 $ 82,484 $ 72,218
Short term investments (note 5) 29,500 41,100  
Marketable securities 556 1,579  
Derivative assets 140 973  
Accounts receivable and other assets 36,370 24,987  
Income tax receivable 130 72  
Other non-current receivables 1,223 562  
Credit risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Cash and cash equivalents 183,074 82,484  
Short term investments (note 5) 29,500 41,100  
Marketable securities 556 1,579  
Derivative assets 140 973  
Accounts receivable and other assets 36,370 24,987  
Income tax receivable 130 72  
Other non-current receivables 1,223 562  
Total financial assets $ 250,993 $ 151,757