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Concentrations of risk and segment information - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue, Major Customer [Line Items]      
Financing Receivable, Significant Sales $ 194,223 $ 250,437 $ 71,066
Factoring fees 1,566 2,148 (591)
Revenue 1,619,971 1,394,205 985,737
United States [Member]      
Revenue, Major Customer [Line Items]      
Revenue 769,200 796,000 498,500
Formerly APAC to EMEA Region [Member]      
Revenue, Major Customer [Line Items]      
Revenue   19,300 10,600
Outside the United States [Member]      
Revenue, Major Customer [Line Items]      
Long-lived assets $ 47,600 $ 25,400 $ 6,000