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Financial instruments, Reconciliation of liabilities arising from financing activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of liabilities arising from financing activities [Abstract]      
Beginning balance [1] $ 853,817 $ 968,759 [2]  
Financing cash flows [1],[3] (287,199) (98,243)  
Non-cash changes [Abstract]      
Amortization [1] 5,538 8,003  
Equity component of convertible notes [1] (119,818) (26,434)  
Other changes [1],[4] 1,681 1,732  
Ending balance [1] 454,019 853,817  
IFRS 16 Leases [Member]      
Reconciliation of liabilities arising from financing activities [Abstract]      
Beginning balance [1],[2] 853,817    
Non-cash changes [Abstract]      
Ending balance [1],[2]   853,817  
Initial recognition of a lease liability     $ 1,484
Bank Loans [Member]      
Reconciliation of liabilities arising from financing activities [Abstract]      
Beginning balance [2] 734,404 823,299  
Financing cash flows [3] (286,733) (91,440)  
Non-cash changes [Abstract]      
Amortization 2,288 2,545  
Ending balance 449,959 734,404 [2]  
Convertible Senior Notes due 2019 [Member]      
Reconciliation of liabilities arising from financing activities [Abstract]      
Beginning balance 0 32,009 [2]  
Financing cash flows [3]   (6,426)  
Non-cash changes [Abstract]      
Amortization   851  
Equity component of convertible notes   (26,434)  
Ending balance   0  
Convertible Senior Notes due 2021 [Member]      
Reconciliation of liabilities arising from financing activities [Abstract]      
Beginning balance [2] 116,568 111,968  
Financing cash flows [3]   (7)  
Non-cash changes [Abstract]      
Amortization 3,250 4,607  
Equity component of convertible notes (119,818)    
Ending balance 0 116,568 [2]  
Office Leases [Member]      
Reconciliation of liabilities arising from financing activities [Abstract]      
Beginning balance [2] 2,846    
Financing cash flows [3] (467) (370)  
Non-cash changes [Abstract]      
Other changes [4] 1,681 1,732  
Ending balance $ 4,060 2,846 [2]  
Office Leases [Member] | IFRS 16 Leases [Member]      
Reconciliation of liabilities arising from financing activities [Abstract]      
Beginning balance [2]   $ 1,484  
[1] The reconciliation does not include interest rate swaps, which are described in note 8.
[2] The opening balance as at January 1, 2019 includes the initial recognition of the lease liability of $1.5 million resulting from the adoption of the IFRS 16 Leases standard.
[3] The cash flows from bank loans make up the net amount of issuance of long term debt and repayment of long term debt in the statement of cash flows.
[4] Other changes for 2020 and 2019 represents new, modified office leases and foreign exchange effects during the year related to IFRS 16 Leases.