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Fair value measurement - Assets and liabilities measured on a recurring basis (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	$ 211,717	$ 237,342
Total assets	211,717	237,342
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	2,603	1,375
Related party
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instruments	2,603	803
Debt
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instruments		572
Fair value hierarchy Level 1
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	211,717	237,342
Total assets	211,717	237,342
Level 3
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	2,603	1,375
Level 3 | Related party
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instruments	$ 2,603	803
Level 3 | Debt
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instruments		$ 572

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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