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Liabilities for Dispositions and Discontinued Operations Site Liabilities Narrative (Details) (USD $) | 12 Months Ended | 240 Months Ended | 732 Months Ended | 12 Months Ended | 240 Months Ended | 780 Months Ended | 12 Months Ended | 240 Months Ended | 924 Months Ended | 12 Months Ended | 180 Months Ended | 408 Months Ended | 12 Months Ended | 180 Months Ended | 816 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2014 Augusta, Georgia [Member] | Dec. 31, 2012 Augusta, Georgia [Member] | Dec. 31, 2011 Augusta, Georgia [Member] | Dec. 31, 2032 Augusta, Georgia [Member] | Dec. 31, 1988 Augusta, Georgia [Member] | Dec. 31, 2012 Spartanburg, South Carolina [Member] | Dec. 31, 2011 Spartanburg, South Carolina [Member] | Dec. 31, 2032 Spartanburg, South Carolina [Member] | Dec. 31, 1989 Spartanburg, South Carolina [Member] | Dec. 31, 2012 East Point, Georgia [Member] | Dec. 31, 2011 East Point, Georgia [Member] | Dec. 31, 2032 East Point, Georgia [Member] | Dec. 31, 1984 East Point, Georgia [Member] | Dec. 31, 2016 Baldwin, Florida [Member] | Dec. 31, 2012 Baldwin, Florida [Member] | Dec. 31, 2011 Baldwin, Florida [Member] | Dec. 31, 2026 Baldwin, Florida [Member] | Dec. 31, 1987 Baldwin, Florida [Member] | Dec. 31, 2012 Other SWP sites [Member] | Dec. 31, 2011 Other SWP sites [Member] | Dec. 31, 2012 Total SWP sites [Member] | Dec. 31, 2011 Total SWP sites [Member] | Dec. 31, 2012 Port Angeles, Washington [Member] | Dec. 31, 2011 Port Angeles, Washington [Member] | Dec. 31, 2026 Port Angeles, Washington [Member] | Dec. 31, 1997 Port Angeles, Washington [Member] | Dec. 31, 2011 Port Angeles Increase in Disposition Reserve [Member] | Dec. 31, 2012 All other sites [Member] | Dec. 31, 2011 All other sites [Member]
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency, Type of Operation |  |  |  |  |  |  |  | wood treatment plant |  |  |  | wood treatment plant |  |  |  | wood treatment plant |  |  |  |  | wood treatment plant |  |  |  |  |  |  |  | dissolving pulp mill |  |  |
Site Contingency, Years in Operation |  |  |  |  |  |  |  | 1928 to 1988 |  |  |  | 1925 to 1989 |  |  |  | 1908 to 1984 |  |  |  |  | 1954 to 1987 |  |  |  |  |  |  |  | 1930 until 1997 |  |  |
Site Contingency, Permit Type |  |  |  |  | 10-year hazardous waste permit issued pursuant to RCRA |  |  |  |  |  |  |  | 10-year RCRA hazardous waste permit, which is currently in the renewal process |  |  |  |  | 10-year hazardous waste permit issued pursuant to RCRA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency, Permit Expiration Date |  |  |  | 2014 |  |  |  |  |  |  |  |  |  |  |  |  | 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency, Environmental Remediation Costs Recognized |  |  |  |  | The majority of visually contaminated surface soils have been removed, and remediation activities currently consist primarily of a groundwater treatment and recovery system. |  |  |  | Remediation activities include: (1) a recovery system and biological wastewater treatment plant, (2) an ozone-sparging system treating soil and groundwater and (3) an ion-exchange resin system treating groundwater. The cost estimate includes potential remediation of identified off-site areas which appear to have been impacted from a portion of the former operating plant. |  |  |  | In 2009, SWP entered into a consent order with the Environmental Protection Division of the Georgia Department of Natural Resources which requires that SWP perform certain additional investigatory, analytical and potentially, remedial activity. |  |  |  |  | Visually contaminated surface soils have been removed, and current remediation activities primarily consist of a groundwater recovery and treatment system. Investigation and assessment of other potential areas of concern are ongoing in accordance with the facility's RCRA permit |  |  |  |  |  |  |  | The site and the adjacent marine areas (a portion of Port Angeles harbor) have been in various stages of the assessment process under the Washington Model Toxics Control Act ("MTCA") since about 2000, and several voluntary interim soil clean-up actions have also been performed during this time. In 2010, the Company entered into an agreed order with the Washington Department of Ecology ('Ecology"), under which the MTCA investigatory, assessment and feasibility and alternatives study process will be completed on a set timetable, subject to approval of all reports and studies by Ecology. |  |  |  |  |  |
Site Contingency, Factors Changing Estimate |  |  |  |  | Current cost estimates could change if recovery or discharge volumes increase or decrease significantly, or if changes to current remediation activities are required in the future. |  |  |  |  |  |  |  | Therefore, while active remedial measures are currently ongoing, additional remedial measures may be necessary in the future. |  |  |  |  | additional remedial activities may be necessary in the future. Therefore, current cost estimates could change. |  |  |  |  |  |  |  | Upon completion of all work required under the agreed order and negotiation of an approved remedy, additional remedial measures for the site and adjacent marine areas may be necessary in the future. |  |  |  |  |  |
Site Contingency, Indication Accrual May Change |  |  |  |  |  |  |  |  | In 2012, SWP entered into a consent decree with the South Carolina Department of Health and Environmental Control which governs future investigatory and assessment activities at the site. Depending on the results of this investigation and assessment, additional remedial actions may be required in the future. Therefore, current cost estimates could change. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Spending-to-Date |  |  |  |  | $ 67,300,000 |  |  |  | $ 38,800,000 |  |  |  | $ 21,000,000 |  |  |  |  | $ 20,600,000 |  |  |  |  |  |  |  | $ 41,200,000 |  |  |  |  |  |
Increase to liabilities | $ 797,000 | $ 6,873,000 | $ 3,201,000 |  | $ (1,000,000) | $ 100,000 |  |  | $ 200,000 | $ 1,400,000 |  |  | $ 900,000 | $ 0 |  |  |  | $ 300,000 | $ 500,000 |  |  | $ (1,800,000) | $ (3,300,000) | $ (1,400,000) | $ (1,300,000) | $ 1,900,000 | $ 7,100,000 |  |  | $ 6,500,000 | $ 300,000 | $ 1,000,000
Environmental Cost Recognized, Caption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | "other operating income, net" |  |
Date through which Recorded Liabilities Cover Estimated Obligations |  |  |  |  |  |  | through 2032 |  |  |  | through 2032 |  |  |  | through 2032 |  |  |  |  | through 2026 |  |  |  |  |  |  |  | The Company's recorded liabilities cover its obligations for estimated assessment, remediation and monitoring obligations that are deemed probable and estimable at this time |  |  |  |

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