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3. Accounts receivable (Tables)
9 Months Ended
Sep. 30, 2014
Receivables [Abstract]  
Accounts Receivable
   September 30, 2014  December 31, 2013
           
Customer receivables, factored  $43,750   $37,874 
Customer receivables, unfactored   11,856    11,763 
   $55,606   $49,637