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Related party transactions (Tables)

6 Months Ended

Jun. 30, 2015

Related Party Transactions [Abstract]

Schedule of related party transactions

A summary of the significant related party transactions for the three and six months ended June 30, 2015 and 2014 is as follows: 

	Three months ended June 30,							Six months ended June 30,
	2015			2014				2015			2014
Net sales to Glencore	$	513,681		$	288,573			$	1,089,410		$	574,156
Purchases from Glencore	133,642			60,998				241,456			124,855
Purchases from BHH	13,434			13,117				28,253			27,723

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- Definition

Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates.

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