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Long-term debt (Annual Interest Rate) (Details) - Subsidiaries - Secured Loan Agreement	12 Months Ended
	Dec. 31, 2018
Citibank N.A. | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.439%
Itau BBA International plc
Debt Instrument [Line Items]
Annual interest rate (as a percent)	5.26%
Banco Santander (Brasil) S.A., Cayman Islands Branch
Debt Instrument [Line Items]
Annual interest rate (as a percent)	4.7863%
Bank of America N.A. | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	4.00%
JP Morgan Chase Bank, N.A. | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.92%

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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