Sales by Product Line (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Sales by Product Line [Line Items]
Revenue, Net	$ 434,306	$ 408,988	$ 371,926	$ 355,780	$ 388,423	$ 385,091	$ 357,397	$ 357,731	$ 1,571,000	$ 1,488,642	$ 1,315,233
Forest Resources
Sales by Product Line [Line Items]
Revenue, Net									230,000	215,000	177,000
Real Estate Segment
Sales by Product Line [Line Items]
Revenue, Net									57,000	71,000	96,000
Performance Fibers Segment
Sales by Product Line [Line Items]
Revenue, Net									1,093,000	1,020,000	881,000
Wood Products Segment
Sales by Product Line [Line Items]
Revenue, Net									88,000	68,000	68,000
Other
Sales by Product Line [Line Items]
Revenue, Net									103,000	115,000	93,000
Development | Real Estate Segment
Sales by Product Line [Line Items]
Revenue, Net									2,000	4,000	3,000
Rural | Real Estate Segment
Sales by Product Line [Line Items]
Revenue, Net									39,000	33,000	28,000
Non-Strategic Timberlands | Real Estate Segment
Sales by Product Line [Line Items]
Revenue, Net									16,000	34,000	65,000
Cellulose Specialties | Performance Fibers Segment
Sales by Product Line [Line Items]
Revenue, Net									935,000	824,000	686,000
Absorbent Materials | Performance Fibers Segment
Sales by Product Line [Line Items]
Revenue, Net									$ 158,000	$ 196,000	$ 195,000