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Long-term debt (Narrative) (Details) R$ in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 11, 2017 USD ($) | Mar. 29, 2017 USD ($) | Mar. 29, 2017 USD ($) | Mar. 16, 2017 USD ($) | Jul. 13, 2016 | Jun. 14, 2016 USD ($) | Jun. 01, 2016 USD ($) | May 05, 2016 | Apr. 21, 2016 | Jan. 29, 2016 | Nov. 30, 2015 | Nov. 25, 2015 | Apr. 24, 2012 BRL (R$) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 30, 2017 USD ($) | Mar. 29, 2016 BRL (R$) lender instrument | Mar. 29, 2016 USD ($) lender instrument | Sep. 27, 2013 USD ($) | Apr. 24, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,019 | $ 4,641 |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,868 | 68,357 | $ 66,880 |  |  |  |  |
2016 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt | R$ |  |  |  |  |  |  |  |  |  |  |  |  | R$ 675,000 |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,699
Redemption price (as a percent) |  |  |  |  | 100.00% |  |  | 97.00% | 100.00% | 97.75% | 93.75% | 93.75% |  |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,313 |
Aggregate principal amount issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 473,800 |
Redemption price, principal amount redeemed |  |  |  | $ 80,000 |  |  | $ 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (as a percent) |  | 107.00% |  | 104.00% |  | 101.00% | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  | 11.60% |  |  | 16.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, amount |  | $ 48,885 | $ 48,885 |  |  | $ 80,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early tender payment |  |  | $ 3,187 |  |  | $ 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2027 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,001 |  |  |  |
Aggregate principal amount issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 265,000 |  |  |  |
Secured Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of secured loan agreement | $ 169,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Loan Agreement | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,243 |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 613,850 | $ 167,262 |  |
Number of lenders | lender |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 5 |  |
Cross-Currency Interest Rate Swaps | Secured Loan Agreement | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments held | instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 5 |  |
Accrued interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,921 | 18,177 |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,491 | $ 24,696 |  |  |  |  |
CDI | Cross-Currency Interest Rate Swaps | Secured Loan Agreement | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% | 4.50% |  |

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