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Related party transactions (Tables)
3 Months Ended
Mar. 31, 2015
Related Party Transactions [Abstract]  
Schedule of related party transactions
A summary of the aforementioned related party transactions for the three months ended March 31, 2015 and 2014 is as follows:
 
Three months ended March 31,
 
2015
2014
Net sales to Glencore
$
575,729

$
285,583

Purchases from Glencore
107,814

63,857

Purchases from BHH
14,820

14,607