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Related party transactions (Tables)
9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]  
Schedule of related party transactions
A summary of the significant related party transactions for the three and nine months ended September 30, 2015 and 2014 is as follows: 
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
2014
 
2015
2014
Net sales to Glencore
$
428,018

$
324,775

 
$
1,517,428

$
898,931

Purchases from Glencore
86,664

69,256

 
328,120

194,111

Purchases from BHH
13,515

10,715

 
41,768

38,438