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Financial obligations (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Financial obligations [Line Items] |  |
Gross non current financial liabilities | $ 552,895 | $ 555,351
Debt issuance costs | (3,803) | (3,119)
Non-current financial liabilities | 549,092 | 552,232
Between 1 and 2 years [member] |  |
Disclosure of Financial obligations [Line Items] |  |
Gross non current financial liabilities | 125,215 | 81,057
Between 2 and 5 years [member] |  |
Disclosure of Financial obligations [Line Items] |  |
Gross non current financial liabilities | $ 427,680 | $ 474,294

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