Segment and Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 3,202,285				$ 3,122,951
Sales	393,719		336,571
Operating Income (Loss)	115,363		82,750
Depreciation, depletion and amortization	35,992		30,413
Forest Resources [Member]
Segment Reporting Information [Line Items]
Assets	1,722,413				1,690,030
Sales	57,102		52,195
Operating Income (Loss)	13,255		8,005
Depreciation, depletion and amortization	16,444		16,833
Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Assets	102,374				112,647
Sales	24,297		12,647
Operating Income (Loss)	16,842		6,478
Depreciation, depletion and amortization	4,177		1,845
Performance Fibers Segment [Member]
Segment Reporting Information [Line Items]
Assets	973,786				902,309
Sales	284,188		250,855
Operating Income (Loss)	91,670		80,630
Depreciation, depletion and amortization	15,153		11,361
Wood Products Segment [Member]
Segment Reporting Information [Line Items]
Assets	0	[1]			18,454	[1]
All Other Segments [Member]
Segment Reporting Information [Line Items]
Assets	31,238				23,296
Sales	28,227		21,140
Operating Income (Loss)	165		(931)
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales	(95)	[2]	(266)	[2]
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Assets	372,474				376,215
Operating Income (Loss)	(6,569)		(11,432)
All Other Segments And Unallocated Amount To Segment [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization	$ 218		$ 374

[1] The Company sold its Wood Products segment during the first quarter of 2013. See Note 2 — Sale of Wood Products Business for additional information.

[2] )Intersegment eliminations primarily reflect sales from our Forest Resources segment to our Performance Fibers segme