Contingencies Subsequent Event (Details)	1 Months Ended	12 Months Ended
	Jan. 31, 2013	Dec. 31, 2012 Anti-dumping investigation [Member] t	Dec. 31, 2012 High purity pulps [Member] Anti-dumping investigation [Member] t
Anti-dumping Investigation [Line Items]
Loss Contingency, Period of Occurrence		February 6, 2013
Subsequent Event, Description	sell all of the assets of its Wood Products business	China's Ministry of Commerce (MOFCOM) notified the Company and a number of other parties that it had commenced an anti-dumping investigation into imports of dissolving, cotton and bamboo pulp into China from the U.S., Canada and Brazil. The notice published by MOFCOM indicates that the investigation was initiated based on a petition filed by a number of primarily commodity viscose pulp manufacturers in China. Nonetheless, as currently scoped by MOFCOM, the investigation includes all dissolving pulp, including the Company's high alpha (high purity) cellulose specialties pulps.
Period under investigation for dumping		calendar year 2012
Period under investigation for determining potential injury		January 1, 2010 until December 31, 2012
Tons of pulp shipped to China		124,000	114,500
Expected duration of investigation		12 to 18 months
Expected time frame for preliminary determination		6 to 9 months after initiation
Expected time frame for final determination		Between 12 and 18 months from initiation
Period for dumping duties		5 years
Impact and conclusion disclosure		The Company will cooperate with this investigation. While no assurances can be given, it is not expected that this matter will have a material adverse effect on the business or financial condition of the Company.