Derivatives, Hedges, Financial Instruments and Carbon Credits (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
The estimated fair value and carrying value of long-term debt
Long-term Debt, Percentage Bearing Variable Interest, Carrying Value	$ 48,125
Long-term Debt, Percentage Bearing Fixed Interest, Carrying Value	24,063
Long-term Debt, Estimated Fair Value	79,399	74,385
Long-term Debt, Carrying Value	79,460	95,392
Secured Term Loan due 2012 [Member]
The estimated fair value and carrying value of long-term debt
Long-term Debt, Percentage Bearing Variable Interest, Estimated Fair Value	72,188	26,721
Long-term Debt, Percentage Bearing Variable Interest, Carrying Value	72,188	48,773
Long-term Debt, Carrying Value	72,188	48,773
Working Capital Revolver Loan due 2012 [Member]
The estimated fair value and carrying value of long-term debt
Long-term Debt, Percentage Bearing Variable Interest, Estimated Fair Value	0	0
Long-term Debt, Percentage Bearing Variable Interest, Carrying Value	0	0
Long-term Debt, Carrying Value	0	0
Other debt [Member]
The estimated fair value and carrying value of long-term debt
Long-term Debt, Percentage Bearing Variable Interest, Estimated Fair Value	0	2,437
Long-term Debt, Percentage Bearing Variable Interest, Carrying Value	0	2,437
Long-term Debt, Carrying Value	7,272	19,719
5.5% Convertible Senior Subordinated Notes due 2012 [Member]
The estimated fair value and carrying value of long-term debt
Long-term Debt, Percentage Bearing Fixed Interest, Estimated Fair Value	0	27,976
Long-term Debt, Percentage Bearing Fixed Interest, Carrying Value	0	26,900
Long-term Debt, Carrying Value	0	26,900
Other bank debt and equipment financing [Member]
The estimated fair value and carrying value of long-term debt
Long-term Debt, Percentage Bearing Fixed Interest, Estimated Fair Value	7,211	17,251
Long-term Debt, Percentage Bearing Fixed Interest, Carrying Value	$ 7,272	$ 17,282

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This element represents the aggregate total of the portion of long-term debt valued at fair value by the entity used in connection with the fair value disclosures required in the footnote disclosures of the financial statements.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of long-term debt valued at fair value by the entity used in connection with the fair value disclosures required in the footnote disclosures of the financial statements which accrued interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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- Definition

+ References

No definition available.

+ Details

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ 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 FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 16

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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