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Trade receivables - Net (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Trade and other receivables [abstract]    
Amount of advances related to allocation of accounts $ 30,000  
Nominal amount of accounts receivables 11,200 $ 23,100
Discounts fees 300 500
Amount of recovered by buyer $ 0 $ 2,700