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Financial Instruments - Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial liabilities    
Severance accrual $ 1,791 $ 1,092
Trade and other current payables 131,743 139,698
Provisions 5,072 8,245
Income taxes payable 8,306 26,131
Other commitments    
Current liabilities 150,528 184,714
Long-term provisions 70,083 61,248
Deferred credit 20,788 20,788
Deferred tax liabilities 148,819 171,228
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Financial liabilities    
Provisions 1,900 5,600
Other commitments    
Long-term provisions 68,600 59,800
Liquidity risk [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 128,486 136,671
Severance accrual 6,200 5,176
Employee compensation 1,466 1,935
Trade and other current payables 136,152 143,782
Loan obligation   3,000
Loss on commodity contracts 51 1,906
Provisions 4,568 4,097
Income taxes payable 8,306 26,131
Other commitments    
Capital and operating expenditure commitments 19,260 19,874
Future employee compensation 6,441 4,773
Credit facility charges 1,550 2,750
Current liabilities 176,328 206,313
Liquidity risk [member] | Within 1 year [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 128,486 136,671
Severance accrual 1,791 1,092
Employee compensation 1,466 1,935
Trade and other current payables 131,743 139,698
Loan obligation   3,000
Loss on commodity contracts 51 1,906
Provisions 3,123 2,681
Income taxes payable 8,306 26,131
Other commitments    
Capital and operating expenditure commitments 7,947 8,812
Future employee compensation 1,530 1,879
Credit facility charges 1,200 1,200
Current liabilities 153,900 185,307
Liquidity risk [member] | 2 - 3 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 3,763 2,273
Employee compensation 0 0
Trade and other current payables 3,763 2,273
Loan obligation   0
Loss on commodity contracts 0 0
Provisions 547 546
Income taxes payable 0 0
Other commitments    
Capital and operating expenditure commitments 7,898 8,883
Future employee compensation 4,911 2,894
Credit facility charges 350 1,550
Current liabilities 17,469 16,146
Liquidity risk [member] | 4-5 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 534 760
Employee compensation 0 0
Trade and other current payables 534 760
Loan obligation   0
Loss on commodity contracts 0 0
Provisions 720 627
Income taxes payable 0 0
Other commitments    
Capital and operating expenditure commitments 2,885 1,390
Future employee compensation 0 0
Credit facility charges 0 0
Current liabilities 4,139 2,777
Liquidity risk [member] | After 5 years [member]    
Financial liabilities    
Accounts payable and accrued liabilities other than: 0 0
Severance accrual 112 1,051
Employee compensation 0 0
Trade and other current payables 112 1,051
Loan obligation   0
Loss on commodity contracts 0 0
Provisions 178 243
Income taxes payable 0 0
Other commitments    
Capital and operating expenditure commitments 530 789
Future employee compensation 0 0
Credit facility charges 0 0
Current liabilities $ 820 $ 2,083