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Management of Financial Risk (Schedule of Company's Liquidity Risk) (Details) - USD ($)
$ in Thousands
Nov. 04, 2021
Oct. 05, 2021
Dec. 31, 2021
Dec. 17, 2021
Nov. 05, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Other liabilities     $ 3,310     $ 2,523  
Cash and cash equivalents     107,097     131,898 $ 83,404
Operating leases     41,655     31,703  
Not later than one year [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Operating leases     12,292     7,367  
Later than one year and not later than five years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Operating leases     13,380     10,209  
Later than five years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Operating leases     15,983     14,127  
Liquidity risk [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables     133,805     65,275  
Debt     166,000     166,000  
Income tax payable     20,563     23,808  
Lease obligations     41,655     31,703  
Other liabilities     3,310     2,523  
Capital commitments     71,759     558  
Provisions     56,112     40,350  
Total financial liabilities     493,204     330,217  
Liquidity risk [member] | Not later than one year [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Trade and other payables     133,805     65,275  
Income tax payable     20,563     23,808  
Lease obligations     12,292     7,367  
Capital commitments     66,542     558  
Provisions     1,883     433  
Total financial liabilities     235,085     97,441  
Liquidity risk [member] | Later than one year and not later than three years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Debt     46,000     120,000  
Lease obligations     11,315     6,166  
Other liabilities     3,310     2,523  
Capital commitments     5,217        
Provisions     5,561     5,444  
Total financial liabilities     71,403     134,133  
Liquidity risk [member] | Later than three years and not later than five years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Debt     120,000     46,000  
Lease obligations     2,065     4,043  
Provisions     23,954     10,692  
Total financial liabilities     146,019     60,735  
Liquidity risk [member] | Later than five years [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Lease obligations     15,983     14,127  
Provisions     24,714     23,781  
Total financial liabilities     40,697     $ 37,908  
Amended Credit Facility [Member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Credit facility, remaining borrowing capacity $ 120,000 $ 120,000   $ 200,000      
Borrowing capacity $ 120,000 $ 200,000     $ 200,000    
Debt term 4 years 4 years          
Amended Credit Facility [Member] | After Three Years [Member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Borrowing capacity $ 150,000 $ 150,000          
Amended Credit Facility [Member] | Receipt of Extension of San Jose Environmental Impact Authorization [Member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Credit facility, remaining borrowing capacity   $ 200,000          
Revolving Credit Facility [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Credit facility, remaining borrowing capacity     $ 80,000