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Financial obligations (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Financial obligations [Line Items] |  |
Gross non current financial liabilities | $ 545,022 | $ 552,895
Debt issuance costs | (4,126) | (3,803)
Non-current financial liabilities | 540,896 | 549,092
Between 1 and 2 years [member] |  |
Disclosure of Financial obligations [Line Items] |  |
Gross non current financial liabilities | 278,397 | 125,215
Between 2 and 5 years [member] |  |
Disclosure of Financial obligations [Line Items] |  |
Gross non current financial liabilities | $ 266,625 | $ 427,680

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