XML 29 R55.htm IDEA: XBRL DOCUMENT v2.4.1.9

Summary of significant accounting policies Long-term Debt Instruments (Details) (USD $)
In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Debt Instrument [Line Items]

Carrying amount of current portion of long term debt

$ 0us-gaap_UnsecuredDebtCurrent

$ 2,603us-gaap_UnsecuredDebtCurrent

Senior secured notes due June 01, 2021 [Member]

Debt Instrument [Line Items]

Interest rate (as a percent)

7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorsecurednotesdueJune012021Member

Senior unsecured notes due August 15, 2014 [Member]

Debt Instrument [Line Items]

Interest rate (as a percent)

7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorUnsecuredNotesDueAugust152014Member

Long-term Debt [Member] | Senior secured notes due June 01, 2021 [Member]

Debt Instrument [Line Items]

Carrying amount of secured long term debt

246,888us-gaap_SecuredLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorsecurednotesdueJune012021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember

246,528us-gaap_SecuredLongTermDebt
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorsecurednotesdueJune012021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember

Fair value of long term debt

256,408us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorsecurednotesdueJune012021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember

244,375us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorsecurednotesdueJune012021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember

Interest rate (as a percent)

7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorsecurednotesdueJune012021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember

7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorsecurednotesdueJune012021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember

Short-term Debt [Member] | Senior unsecured notes due August 15, 2014 [Member]

Debt Instrument [Line Items]

Carrying amount of current portion of long term debt

0us-gaap_UnsecuredDebtCurrent
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorUnsecuredNotesDueAugust152014Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember

^[1],[2]

2,603us-gaap_UnsecuredDebtCurrent
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorUnsecuredNotesDueAugust152014Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember

Fair value of current portion of long term debt

$ 0us-gaap_ShorttermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorUnsecuredNotesDueAugust152014Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember

$ 2,487us-gaap_ShorttermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorUnsecuredNotesDueAugust152014Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember

Interest rate (as a percent)

7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorUnsecuredNotesDueAugust152014Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember

7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cenx_SeniorUnsecuredNotesDueAugust152014Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember

[1]	The amount outstanding was repaid upon maturity.
[2]	These items are recorded in accrued and other current liabilities based on the repayment terms and expected maturity.

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_SecuredLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_ShorttermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20

-Article 5

+ Details

Name:	us-gaap_UnsecuredDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cenx_SeniorsecurednotesdueJune012021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cenx_SeniorUnsecuredNotesDueAugust152014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_ShortTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: