Segment and Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Dec. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 2,793,883				$ 2,569,348
Sales	355,780		357,731
Operating Income (Loss)	84,009		87,578
Depreciation, depletion and amortization	31,168		31,870
Forest Resources [Member]
Segment Reporting Information [Line Items]
Assets	1,618,311				1,603,515
Sales	52,195		48,180
Operating Income (Loss)	8,005		11,050
Depreciation, depletion and amortization	16,833		15,404
Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Assets	107,080				102,682
Sales	12,647		13,462
Operating Income (Loss)	6,478		7,372
Depreciation, depletion and amortization	1,845		2,691
Performance Fibers Segment [Member]
Segment Reporting Information [Line Items]
Assets	706,260				646,447
Sales	250,855		251,163
Operating Income (Loss)	80,630		75,710
Depreciation, depletion and amortization	11,361		12,715
Wood Products Segment [Member]
Segment Reporting Information [Line Items]
Assets	21,758				21,264
Sales	19,209		15,790
Operating Income (Loss)	923		453
Depreciation, depletion and amortization	755		821
All Other Segments [Member]
Segment Reporting Information [Line Items]
Assets	23,456				24,576
Sales	21,140		30,412
Operating Income (Loss)	(931)		799
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales	(266)	[1]	(1,276)	[1]
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Assets	317,018				170,864
Operating Income (Loss)	(11,096)		(7,806)
All Other Segments And Unallocated Amount To Segment [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization	$ 374		$ 239

[1] Intersegment eliminations primarily reflect sales from our Forest Resources segment to our Performance Fibers segment