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Commitments and contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 MW
OR Power Purchase Agreement Abstract]
Power currently available under the power purchase agreement (in megawatts)	47.5
Power prepayments	$ 2,000
Labor Commitments [Abstract]
Percentage of U.S. based work force represented by a union (in hundredths)	73.00%
Percentage of Grundartangi work force represented by the labor unions (in hundredths)	82.00%
Percentage of Vlissingen work force represented by the labor union (in hundredths)	77.00%

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- Definition

The percentage of a Company's work force, based in the country of domicile, that are subject to collective bargaining agreements.

+ References

No definition available.

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- Definition

The percentage of a Company's Netherlands work force that are subject to collective bargaining agreements

+ References

No definition available.

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- Definition

The percentage of a Company's Icelandic work force that are subject to collective bargaining agreements.

+ References

No definition available.

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- Definition

The power currently available under the power purchase agreement.

+ References

No definition available.

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- Definition

Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the 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 210.5-02.17)

-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 17

-Article 5

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