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Related party transactions | 12 Months Ended
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Dec. 31, 2015
Related Party Transactions [Abstract] |
Related party transactions | Related party transactions The significant related party transactions occurring during the years ended December 31, 2015, 2014 and 2013 are described below. Glencore ownership Through its ownership of our common and preferred stock, Glencore plc and its subsidiaries (together, "Glencore") has an overall 47.5% economic ownership in Century Aluminum. Sales to Glencore Pursuant to several agreements with Glencore, we sell substantially all of our production to Glencore. Glencore purchases the aluminum we produce for resale to end users. Glencore purchases substantially all of the aluminum produced at our North American smelters pursuant to that certain sales agreement, effective as of December 31, 2014 (the "U.S. Sales Agreement"). Under the U.S. Sales Agreement, Glencore purchases our aluminum on a take or pay basis at prices determined by reference to the Midwest Transaction Price plus additional negotiated product premiums. The current term of the U.S. Sales Agreement continues through December 31, 2016. Glencore has also agreed to purchase substantially all primary aluminum produced at Grundartangi from 2014 through 2017 at market prices, less commitments under existing tolling contracts (the "Glencore Grundartangi Metal Agreement"). The price for aluminum delivered to Glencore under the Glencore Grundartangi Metal Agreement is determined by reference to the LME price for primary aluminum, plus the European Duty Paid premium and any applicable product premiums. We have also entered into a tolling agreement with Glencore for 90,000 tpy through July 2016. Under this agreement, Glencore provides Grundartangi alumina for processing and receives primary aluminum in return for tolling fees that are based on the price of primary aluminum. We had a long-term contract to sell Glencore primary aluminum, at a variable price based on the LME, adjusted by a negotiated U.S. Midwest market premium with a cap and floor as applied to the current U.S. Midwest premium, which expired at the end of 2013. In addition, we had a contract to sell Glencore all U.S. produced primary aluminum, less existing sales agreements and high-purity metal sales, which expired at the end of 2013. We sold high-purity metal in 2013 on a spot basis at variable prices based on the LME, plus U.S. Midwest premium and product premiums. We believe that all of the transactions with Glencore were at prices that approximate market. Purchases from Glencore We purchase alumina from Glencore on both a spot and long-term contract basis. We are party to a long-term alumina supply agreement with Glencore, in which Glencore has agreed to supply us with alumina through 2017 at prices indexed to the LME price of primary aluminum. In 2014, upon mutual agreement, approximately half of the purchases under this agreement were priced based on a published alumina index. For 2015, we priced all of the purchases under this agreement based on a published alumina index. We had additional agreements to buy alumina from Glencore, which expired at the end of 2014 and 2013. In 2014 and 2013, the pricing on these alumina purchase agreements for Grundartangi was indexed to the LME price for primary aluminum. We believe that the alumina purchased from Glencore under these contracts were purchased at prices that approximate market. Transactions with BHH We own a 40% stake in BHH, a carbon anode and cathode facility located in the Guangxi Zhuang Autonomous Region of south China. We purchase carbon anodes from BHH. 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 related party transactions for the years ended December 31, 2015, 2014 and 2013 is as follows:
| Year Ended December 31,
| 2015 | 2014 | 2013
Net sales to Glencore | $ | 1,867,711 |  | $ | 1,262,101 |  | $ | 511,051 |
Purchases from Glencore | 393,158 |  | 285,167 |  | 173,693 |
Purchases from BHH | 46,592 |  | 47,804 |  | 86,678 |

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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 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: 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 3: 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 4: 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 5: 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 Reference 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph b -Article 3A + Details
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