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Business Segments Segment Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Primary $ 1,971,900cenx_SegmentReportingPrimaryAssets [1] $ 1,770,749cenx_SegmentReportingPrimaryAssets [1] $ 1,730,321cenx_SegmentReportingPrimaryAssets [1]
Corporate, unallocated 42,135cenx_SegmentReportingCorporateUnallocatedAssets [1] 39,447cenx_SegmentReportingCorporateUnallocatedAssets [1] 46,005cenx_SegmentReportingCorporateUnallocatedAssets [1]
TOTAL $ 2,014,035us-gaap_Assets [1] $ 1,810,196us-gaap_Assets [1] $ 1,776,326us-gaap_Assets [1]
[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.