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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Components of pre-tax book income (loss) [Abstract] |  |  |  |  |
U.S. | $ (22,865) |  | $ 37,487 |  | $ (114,273)
Foreign | 45,104 |  | 30,059 |  | (35,870)
Total | 22,239 |  | 67,546 |  | (150,143)
Current [Abstract] |  |  |  |  |
U.S. federal current expense (benefit) | (22) |  | 191 |  | (22,166)
State current expense (benefit) | 1,395 |  | (1,047) |  | (1,294)
Foreign current expense (benefit) | 13,467 |  | 11,485 |  | (2,123)
Total current expense (benefit) | 14,840 |  | 10,629 |  | (25,583)
Deferred [Abstract] |  |  |  |  |
U.S. federal expense (benefit) | (5,772) |  | (2,945) |  | (3,024)
State deferred expense | 0 |  | (75) |  | 677
Foreign deferred tax expense | 5,291 |  | 3,524 |  | 15,573
Total deferred expense (benefit) | (481) |  | 504 |  | 13,226
Total income tax expense (benefit) | 14,359 |  | 11,133 |  | (12,357)
Reconciliation of statutory U.S. Federal income tax rate to effective income tax rate on income (loss) [Abstract] |  |  |  |  |
Federal statutory rate (in hundredths) | 35.00% |  | 35.00% |  | 35.00%
Permanent differences (in hundredths) | 38.20% |  | (9.80%) |  | (1.00%)
State taxes, net of Federal benefit (in hundredths) | 6.30% |  | (1.70%) |  | 7.60%
Foreign earnings taxed at different rates than U.S. (in hundredths) | (93.90%) |  | (27.80%) |  | 3.00%
Equity earnings in joint ventures (in hundredths) | 0.00% |  | 0.00% |  | 1.70%
Unremitted earnings (in hundredths) | 33.60% |  | 7.30% |  | 10.70%
Valuation allowance (in hundredths) | 65.80% |  | 22.70% |  | (57.00%)
Changes in uncertain tax reserves (in hundredths) | 5.60% |  | (5.10%) |  | 8.20%
Other (in hundredths) | (26.00%) |  | (4.10%) |  | 0.00%
Effective tax rate (in hundredths) | 64.60% |  | 16.50% |  | 8.20%
Deferred tax assets [Abstract] |  |  |  |  |
Accrued postretirement benefit cost | 8,281 |  | 8,690 |  |
Accrued liabilities | 3,308 |  | 11,963 |  |
Share-based compensation | 3,758 |  | 4,169 |  |
Derivative and hedging contracts | 103,048 |  | 25,157 |  |
Goodwill | 17,551 |  | 20,760 |  |
Equity contra - other comprehensive loss | 77,142 |  | 55,810 |  |
Capital losses | 7,506 |  | 7,802 |  |
Net operating losses | 619,357 |  | 675,427 |  |
Other | 55 |  | 39 |  |
Total deferred tax assets | 840,006 |  | 809,817 |  |
Valuation allowance | (773,714) |  | (714,423) |  |
Net deferred tax assets | 66,292 |  | 95,394 |  |
Deferred tax liabilities [Abstract] |  |  |  |  |
Tax over financial statement depreciation | (147,021) |  | (152,204) |  |
Pension | (7,021) |  | (1,311) |  |
Derivative and hedging contracts | (10,450) |  | 0 |  |
Income from domestic partnership | 4 |  | 3 |  |
Unremitted foreign earnings | 0 |  | (23,560) |  |
Foreign basis differences | (3,212) |  | (4,321) |  |
Total deferred tax liabilities | (157,250) |  | (181,393) |  |
Net deferred tax liability | (90,958) |  | (85,999) |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Cumulative amount of foreign undistributed net earnings for which no deferred taxes have been provided | 159,087 |  |  |  |
Reconciliation of beginning and ending amounts of gross unrecognized tax benefits (excluding interest) [Roll forward] |  |  |  |  |
Balance, beginning of period | 16,600 |  | 21,200 |  | 21,600
Additions based on tax positions related to the current year | 2,500 |  | 4,400 |  | 5,200
Reductions based on tax positions related to the current year | 0 |  | 0 |  | 0
Additions based on tax positions of prior years | 0 |  | 0 |  | 0
Reductions for tax positions of prior years | 0 |  | 0 |  | (4,600)
Decreases due to lapse of applicable statute of limitations | (3,200) |  | (9,000) |  | (700)
Settlements | 0 |  | 0 |  | (300)
Balance, end of period | 15,900 |  | 16,600 |  | 21,200
Unrecognized tax positions [Abstract] |  |  |  |  |
Tax positions whose tax characterization is highly certain but for which there is uncertainty about timing of tax return inclusion | 15,100 |  | 14,600 |  | 17,400
Remaining amount of unrecognized tax benefits that would affect effective tax rate if recognized | 800 |  | 2,000 |  | 4,600
Unrecognized tax position balance, end of period | 15,900 |  | 16,600 |  | 21,200
Interest and penalties related to unrecognized tax benefits | 100 |  | 300 |  | 1,700
Federal [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
NOL carry forwards | 1,447,616 | [1] | 1,691,172 | [1] |
NOL carry forwards, expiration dates | 2028 |  | 2028 |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years subject to examination | Beginning in 2008 |  |  |  |
State [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
NOL carry forwards | 1,450,934 | [2] | 1,133,249 | [2] |
NOL carry forwards, expiration dates | 2027 |  | 2027 |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years subject to examination | Beginning in 2005 |  |  |  |
Icelandic [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
NOL carry forwards | 298,113 | [3] | 185,881 | [3] |
NOL carry forwards, expiration dates | 2016 |  | 2016 |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years subject to examination | Beginning in 2005 |  |  |  |
Valuation Allowance, Operating Loss Carryforwards [Member] |  |  |  |  |
Change in deferred tax asset valuation allowance [Abstract] |  |  |  |  |
Balance at Beginning of Period | 714,423 |  | 681,094 |  |
US operating losses | 59,291 |  | 33,329 |  |
Balance at End of Period | $ 773,714 |  | $ 714,423 |  |
[1] | The federal NOL begins to expire in 2028.
[2] | The state NOL begins to expire in 2027.
[3] | The Icelandic NOL begins to expire in 2016.

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- Definition The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of pension liabilities funded in advance and the basis of a prepaid pension asset determined in accordance with generally accepted accounting principles. The difference in basis of such costs will increase future taxable income when such basis difference reverses. Prepaid pension costs represented the cumulative employer's contributions in excess of net pension cost recognized, before the adoption of the recognition provisions of FAS 158. Under FAS 158, prepaid pension costs are no longer recognized in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(4) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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