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Related party transactions (Summary of Related Party Outstanding Balances) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Related Party Transaction [Line Items] |  |
Miscellaneous | $ 99,049 | $ 98,291
Axionlog Distribution B.V. |  |
Related Party Transaction [Line Items] |  |
Accounts and notes receivable | 860 | 1,097
Other receivables | 1,676 | 979
Miscellaneous | 2,963 | 3,126
Accounts payable | $ (14,984) | $ (11,727)

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