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Related party transactions (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Related Party Transactions [Abstract]

Schedule of related party transactions

A summary of the aforementioned significant related party transactions for the three months ended March 31, 2017 and 2016 is as follows: 

		Three months ended March 31,
		2017			2016
Net sales to Glencore		$	280,573		$	280,377
Purchases from Glencore		71,581			44,013
Purchases from BHH		2,780			2,383

A summary of the aforementioned significant related party transactions for the years ended December 31, 2016, 2015 and 2014 is as follows:

	Year Ended December 31,
	2016			2015			2014
Net sales to Glencore	$	1,178,631		$	1,867,711		$	1,262,101
Purchases from Glencore	231,850			393,158			285,167
Purchases from BHH	10,127			46,592			47,804

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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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