Fair value measurement - Changes in Level 3 Liabilities and Contingent Consideration (Details) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Changes in Level 3 liabilities
Beginning Balance	$ 1,600
Ending Balance	1,900
Contingent consideration
Fair value of derivative financial instruments	1,600
Level 3
Changes in Level 3 liabilities
Beginning Balance	5,599
(Gains) / losses recognized in profit or loss	(3,516)
Currency translation effects	(141)
Ending Balance	1,942
Contingent consideration
Fair value of derivative financial instruments	5,599
Level 3 \| Contingent consideration
Changes in Level 3 liabilities
Beginning Balance	3,964
(Gains) / losses recognized in profit or loss	(3,846)
Currency translation effects	(118)
Contingent consideration
Fair value of derivative financial instruments	3,964
Level 3 \| Derivative financial instruments
Changes in Level 3 liabilities
Beginning Balance	1,635
(Gains) / losses recognized in profit or loss	330
Currency translation effects	(23)
Ending Balance	1,942
Contingent consideration
Fair value of derivative financial instruments	$ 1,635

Currency translation effects to financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

No definition available.

+ Details

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- References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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