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Related party transactions (Summary of Related Party Transactions) (Details) - Axionlog Distribution B.V. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Food and paper	$ (188,276)	$ (177,356)	$ (173,387)
Occupancy and other operating expenses	(7,252)	(5,322)	(4,281)
Logistics service fees from related party	38,658	41,633	48,773
Suppliers purchase expense related party	$ 149,618	$ 135,723	$ 124,614

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- Definition

Food and paper from related party

+ References

No definition available.

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Balance Type:	debit
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X

- Definition

Logistics service fees from related party

+ References

No definition available.

+ Details

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- Definition

Suppliers purchase expense related party

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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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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- Details

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