XML 121 R110.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Business segments - Segment Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Segment Reporting [Abstract] |  |  |  |
Primary |  | $ 1,492,964 | $ 1,706,032 | $ 1,987,727
Corporate, unallocated |  | 47,363 | 46,436 | 37,331
TOTAL | $ 1,525,807 | $ 1,540,327 | $ 1,752,468 | $ 2,025,058

X
- Definition The remaining assets are unallocated corporate assets. Not including: Segment assets include cash and cash equivalents, accounts receivable, due from affiliates, prepaid and other current assets, inventory, intangible assets and property, plant and equipment-net. + References No definition available. + Details
Name: | cenx_SegmentReportingCorporateUnallocatedAssets
Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Segment assets include cash and cash equivalents, 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. + References No definition available. + Details
Name: | cenx_SegmentReportingPrimaryAssets
Namespace Prefix: | cenx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration