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Related party transactions (Tables)

12 Months Ended

Dec. 31, 2017

Related Party Transactions [Abstract]

Schedule of related party transactions

A summary of the aforementioned significant related party transactions for the years ended December 31, 2017, 2016 and 2015 is as follows:

	Year Ended December 31,
	2017				2016				2015
Net sales to Glencore	$	1,198,076			$	1,178,631			$	1,867,711
Purchases from Glencore	253,044				231,850				393,158
Purchases from BHH	15,763				10,127				46,592

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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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