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Share Based Compensation Share and performance-based compensation expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share and performance-based compensation expense [Abstract]
Performance-based share expense	$ 1,090cenx_Performancebasedshareexpense	$ 475cenx_Performancebasedshareexpense	$ 27cenx_Performancebasedshareexpense
Service-based share expense	244cenx_ServiceBasedStockExpense	603cenx_ServiceBasedStockExpense	586cenx_ServiceBasedStockExpense
Stock option expense	0us-gaap_StockOptionPlanExpense	0us-gaap_StockOptionPlanExpense	0us-gaap_StockOptionPlanExpense
Total share-based compensation expense before income tax	1,334us-gaap_AllocatedShareBasedCompensationExpense	1,078us-gaap_AllocatedShareBasedCompensationExpense	613us-gaap_AllocatedShareBasedCompensationExpense
Income tax	0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total share-based compensation expense, net of income tax	1,334us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	1,078us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	613us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Unrecognized compensation expense	$ 1,826us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted average period of expense recognition (in time period)	1 year

X

- Definition

The amount of expense, gross of income tax, recognized during the period arising from performance-based share arrangements.

+ References

No definition available.

+ Details

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X

- Definition

The amount of expense, gross of income tax, recognized during the period arising from service based compensation arrangements.

+ References

No definition available.

+ Details

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Namespace Prefix:	cenx_
Data Type:	xbrli:monetaryItemType
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- Details

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X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

+ Details

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X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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