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Business segments
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Business segments
Business segments
Century Aluminum is a producer of primary aluminum, which trades as a global commodity. We are organized as a holding company with each of our operating primary aluminum smelters managed and operated as a separate facility reporting to our corporate headquarters. Each of our operating primary aluminum smelters meets the definition of an operating segment. We evaluated the similar economic and other characteristics, including nearly identical products, production processes, customers and distribution and have aggregated our four operating segments into one reportable segment, primary aluminum, based on these factors. In addition, all of our primary aluminum smelters share several key economic factors inherent in their common products and production processes. For example, all of our facilities' revenue is based on the LME price for primary aluminum.
A reconciliation of our consolidated assets to the total of primary aluminum segment assets is provided below.
Segment assets (1)
2015
 
2014
 
2013
Primary
$
1,706,032

 
$
1,987,727

 
$
1,770,749

Corporate, unallocated
46,436

 
37,331

 
39,447

Total assets
$
1,752,468

 
$
2,025,058

 
$
1,810,196

(1)
Segment assets include accounts receivable, due from affiliates, prepaid and other current assets, inventory, intangible assets and property, plant and equipment — net; the remaining assets are unallocated corporate assets.
Geographic information
Included in the consolidated financial statements are the following amounts related to geographic locations:
 
2015
 
2014
 
2013
Net sales:
 
 
 
 
 
United States
$
1,373,714

 
$
1,370,570

 
$
1,022,081

Iceland
576,143

 
560,472

 
432,232

Long-lived assets: (1)
 

 
 

 
 

United States
$
408,722

 
$
497,057

 
$
392,424

Iceland
801,268

 
831,507

 
853,636

Other
94,421

 
95,752

 
93,075

(1)
Includes long-lived assets other than financial instruments.
Major customer information
The following table shows our major customers whose sales revenue exceeded 10% of our net sales.  A loss of any of these customers could have a material adverse effect on our results of operations.  The net sales revenue for these customers is as follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
Glencore
$
1,867,711

 
$
1,262,101

 
$
511,051

Southwire
—

 
226,740

 
312,102

RTA
—

 
—

 
223,353

BHP Billiton
—

 
—

 
191,445