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Concentrations of risk and segment information - Schedule of Factored Accounts Receivables (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Factored Accounts Receivable [Abstract]      
Financing Receivable, Significant Sales $ 194,223 $ 250,437 $ 71,066
Factoring fees $ 1,566 $ 2,148 $ (591)