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Financial instruments - Reconciliation of liabilities arising from financing activities (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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