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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities $ 139,698 $ 143,502
Current portion of finance lease 5,734 3,559
Current portion of finance lease 7,700 7,300
Current severance liability 1,092 688
Provisions 8,245 8,499
Income tax payable 26,131 25,911
Total contractual obligations 184,714 184,286
Minimum finance lease payments payable, at present value 7,559 7,101
Restricted Stock Unit obligation 4,100 4,800
Non-current provisions 61,248 51,444
Deferred credit 20,788 20,788
Deferred tax liabilities (Note 28) 171,228 170,863
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Provisions 5,600 5,200
Provisions 142,200 122,100
Non-current provisions $ 59,800 50,400
Restricted Share Units [member] | First Anniversary of Grant [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Award vesting (percent) 50.00%  
Restricted Share Units [member] | Second Anniversary of Grant [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Award vesting (percent) 50.00%  
Liquidity risk [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities $ 136,506 141,002
Credit facility 2,750 38,440
Loan obligation 3,000  
Current portion of finance lease 7,724 7,321
Current severance liability 5,176 3,986
Employee Compensation & RSU’s 6,709 6,918
Unrealized loss on commodity contracts 1,906 2,815
Provisions 4,097 4,719
Income tax payable 26,131 25,911
total contractual obligations 193,999 231,112
Liquidity risk [member] | Within 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 136,506 141,002
Accounts payable and other liabilities, future interest component 0 0
Accounts payable and other liabilities 136,506 141,002
Credit facility 0 0
Credit facility, future interest component 1,200 960
Credit facility 1,200 960
Loan obligation 3,000  
Loan obligation, future interest component 0  
Loan obligation 3,000  
Current portion of finance lease 5,734 3,559
Current portion of finance lease, future interest component 145 161
Current portion of finance lease 5,879 3,720
Current severance liability 1,092 689
Current severance liability, future interest component 0 0
Current severance liability 1,092 689
Employee Compensation & RSU’s 2,100 1,812
Employee Compensation & RSU's, future interest component 1,715 2,184
Employee Compensation & RSU’s 3,815 3,996
Unrealized loss on commodity contracts 1,906 2,815
Unrealized loss on commodity contracts, future interest component 0 0
Unrealized loss on commodity contracts 1,906 2,815
Provisions 2,681 3,262
Provisions, future interest component 0 0
Provisions 2,681 3,262
Income tax payable 26,131 25,911
Income tax payable, future interest component 0 0
Income tax payable 26,131 25,911
Total contractual obligations 179,150 179,050
Total contractual obligations, future interest component 3,060 3,305
total contractual obligations 182,210 182,355
Liquidity risk [member] | 2 - 3 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 0 0
Credit facility 1,550 1,280
Loan obligation 0  
Current portion of finance lease 1,845 3,601
Current severance liability 2,273 658
Employee Compensation & RSU’s 2,894 2,922
Unrealized loss on commodity contracts 0 0
Provisions 546 562
Income tax payable 0 0
total contractual obligations 9,108 9,023
Liquidity risk [member] | 4-5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 0 0
Credit facility 0 36,200
Loan obligation 0  
Current portion of finance lease 0 0
Current severance liability 760 365
Employee Compensation & RSU’s 0 0
Unrealized loss on commodity contracts 0 0
Provisions 627 629
Income tax payable 0 0
total contractual obligations 1,387 37,194
Liquidity risk [member] | After 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 0 0
Credit facility 0 0
Loan obligation 0  
Current portion of finance lease 0 0
Current severance liability 1,051 2,274
Employee Compensation & RSU’s 0 0
Unrealized loss on commodity contracts 0 0
Provisions 243 266
Income tax payable 0 0
total contractual obligations $ 1,294 $ 2,540