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Financial instruments - Reconciliation of liabilities arising from financing activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of liabilities arising from financing activities    
As of beginning of period [1] $ 786,204 $ 701,495
Repurchase convertible notes [1] 0 (17,104)
Financing cash flows [1],[2] 168,345 93,157
As of end of period [1] 967,275 786,204
Non-cash changes    
Amortization [1] 11,559 7,375
Equity component of convertible notes [1] (1,553) 2,213
Other Changes [1],[3] 2,720 (932)
Bank Loans [Member]    
Reconciliation of liabilities arising from financing activities    
As of beginning of period 687,942 591,579
Financing cash flows [2] 129,400 93,157
As of end of period 823,299 687,942
Non-cash changes    
Amortization 6,826 3,206
Other Changes [3] (869) 0
Convertible Senior Notes due 2019 [Member]    
Reconciliation of liabilities arising from financing activities    
As of beginning of period 98,262 109,916
Repurchase convertible notes 0 (17,104)
Fair value changes [4] (74,644) 0
As of end of period 32,009 98,262
Non-cash changes    
Amortization 3,188 4,170
Equity component of convertible notes 1,613 2,213
Other Changes [3] 3,589 (932)
Convertible Senior Notes due 2021 [Member]    
Reconciliation of liabilities arising from financing activities    
As of beginning of period 0 0
Fair value changes [4] 74,644 0
Financing cash flows [2] 38,945 0
As of end of period 111,968 0
Non-cash changes    
Amortization 1,545 0
Equity component of convertible notes $ (3,165) $ 0
[1] The reconciliation does not include interest rate swaps, which are described in note 8.
[2] 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. In 2018 the cash flows from the transaction related to the exchange of convertible senior notes due 2019 of $38.9 million consists of $41.6 million cash received upon issue, less transaction costs of $2.7 million.
[3] Other changes represents the (gain)/loss on extinguishment of debt, including previously capitalized fees.
[4] Fair value changes reflects the loss arising from the exchange of the convertible senior notes due 2019 to convertible senior notes due 2021 below market fair value.