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Transactions with related parties - Executive - Administrative Services Agreement (Details) € in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 21, 2014 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 30, 2014 USD ($)
Related Party Transaction [Line Items]
Eur/US Dollar exchange rate		1.1998
Administrative services fee		$ 120	$ 120	$ 120
Executive services agreement
Related Party Transaction [Line Items]
Annual executive services fee	€ 538	$ 645
Executive services agreement duration	Initial term of five years and automatically renews for successive five year terms unless terminated earlier.
Executive Services Agreement - Initial Term
Related Party Transaction [Line Items]
Executive services agreement duration	5 years
Executive Services Agreement - Automatic Renewal
Related Party Transaction [Line Items]
Executive services agreement duration	5 years
Administrative Services Agreement
Related Party Transaction [Line Items]
Administrative services duration		perpetual
Administrative services days termination notice		120 days
Administrative Services Agreement | Monthly fee
Related Party Transaction [Line Items]
Administrative services fee					$ 10

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- Definition

Days notice required for termination of administrative services agreement.

+ References

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- Definition

Administrative services agreement duration.

+ References

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- Definition

Executive services agreement duration.

+ References

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- Definition

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- Definition

Amount fee charged by the management company for the provision of executive services.

+ References

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- Definition

Amount of expense for administrative services provided to the limited liability company (LLC) or limited partnership (LP) by the managing member or general partner, affiliate of managing member or general partner, or affiliate of LLC or LP, for example, but not limited to, salaries, rent, or overhead costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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