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Related party transactions | 12 Months Ended
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Dec. 31, 2016
Related Party Transactions [Abstract] |
Related party transactions | Related party transactions The significant related party transactions occurring during the years ended December 31, 2016, 2015 and 2014 are described below. We believe that all of our transactions with Glencore were at prices that approximate market. Glencore ownership As of December 31, 2016, Glencore owns 42.9% of Century’s outstanding common stock (47.5% on a fully-diluted basis assuming the conversion of all of the Series A Convertible Preferred Stock) and all of our outstanding Series A Convertible Preferred stock. See Note 7 Shareholder's equity for a full description of our outstanding Series A Convertible Preferred stock. From time to time Century and Glencore enter into various transactions for the purchase and sale of primary aluminum, purchase and sale of alumina, tolling agreements and certain forward financial contracts. Sales to Glencore For the year ended December 31, 2016, we derived approximately 89% of our consolidated sales from Glencore. Glencore purchased substantially all of the aluminum produced at our North American smelters during 2016 under a purchase and sale agreement, effective as of December 31, 2014 (the "2015-2016 US Sales Agreement"). The 2015-2016 US Sales Agreement expired on December 31, 2016. We have since entered into a new agreement with Glencore pursuant to which Glencore has agreed to purchase certain aluminum products produced at our North American smelters in 2017. The pricing for aluminum sold under these agreements is determined by reference to the Midwest Transaction Price plus additional negotiated product premiums. We have also entered into an agreement with Glencore pursuant to which Glencore has agreed to purchase substantially all of the primary aluminum produced at Grundartangi through 2017 at prices based on the LME price for primary aluminum plus the European Duty Paid premium and any applicable product premiums. We also received tolling fees from Glencore under a tolling agreement that provided for delivery of primary aluminum produced at Grundartangi through June 2016. The fee paid by Glencore under this tolling agreement was based on the LME price for primary aluminum plus a portion of the European Duty Paid premium. Glencore purchases the aluminum we produce for resale. Purchases from Glencore We purchase a portion of our alumina requirements from Glencore under a long-term supply agreement and on a spot basis. Pursuant to our current agreement, Glencore has agreed to supply us with alumina through 2017 at prices based on a published alumina index. Financial contracts with Glencore During 2016, we entered into certain financial contracts with Glencore. As of December 31, 2016, we had an open position of 60,600 tonnes related to LME forward financial sales contracts with Glencore to fix the forward LME price (the “Forward Sales Contracts”). The Forward Sales Contracts settle monthly, on a ratable basis, through December 31, 2017. From time to time, we enter into financial contracts to offset fixed price sales arrangements with certain of our customers. As of December 31, 2016, we had an open position related to such arrangements of 9,531 tonnes (the “fixed for floating swaps”). Fixed for floating swaps settle at various dates up to and including January 2018. Changes in fair value and settlements of these derivative instruments are not material to the consolidated financial statements for all periods presented. Transactions with BHH We own a 40% stake in BHH and purchase carbon anodes from them for use in our manufacturing operations. In the fourth quarter of 2015, we completed the construction of a second furnace at our carbon anode facility in Vlissingen, Netherlands. This investment increases our capacity to produce carbon anodes and reduces our need to source carbon anodes from BHH. As a result, in the fourth quarter of 2015, we made the decision to pursue an exit from our investment in BHH. In connection with our exit plan, we concluded that our investment in BHH was other than temporarily impaired and recorded a charge of $11,584. Fair value for the investment was based on a proposed sale transaction for a portion of the investment. Summary 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 The entire disclosure for related party transactions. Examples of related party transactions include 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864 + Details
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