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Related party transactions (Narrative) (Details) - USD ($) $ in Thousands			12 Months Ended
	May 27, 2016	Nov. 09, 2011	Dec. 31, 2018	Dec. 31, 2017
Axionlog Distribution B.V.
Related Party Transaction [Line Items]
Revolving loan, related parties, borrowing capacity		$ 12,000
Proceeds from related party debt	$ 1,800
Accounts payable, related party			$ 14,984	$ 11,727
Lacoop, A.C. And Lacoop II, S. C.
Related Party Transaction [Line Items]
Other receivables, related party			2,692	2,112
Accounts payable, related party			$ 1,634	$ 1,113
LIBOR | Axionlog Distribution B.V.
Related Party Transaction [Line Items]
Debt instrument, basis spread on variable rate (as a percent)		6.00%

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Other receivables, related party

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Amount for accounts payable to related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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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.

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