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Trade and other receivables - Trade and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]    
Trade accounts receivable $ 21,724 $ 20,439
Other receivables 7,706 1,637
Contract assets 9,094 1,004
Trade and other receivables $ 38,524 $ 23,080