Segment and Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 2,913,868				$ 2,913,868				$ 2,569,348
Sales	408,988		385,091		1,136,694		1,100,218
Operating Income (Loss)	113,174		108,310		295,774		274,961
Depreciation, depletion and amortization	36,313		38,895		102,499		101,758
Forest Resources [Member]
Segment Reporting Information [Line Items]
Assets	1,623,370				1,623,370				1,603,515
Sales	59,853		57,265		164,711		162,482
Operating Income (Loss)	11,184		10,792		27,438		33,681
Depreciation, depletion and amortization	18,793		16,614		52,662		47,866
Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Assets	110,582				110,582				102,682
Sales	13,043		32,177		37,369		57,945
Operating Income (Loss)	8,420		28,077		20,897		40,458
Depreciation, depletion and amortization	1,288		5,677		4,733		10,598
Performance Fibers Segment [Member]
Segment Reporting Information [Line Items]
Assets	840,082				840,082				646,447
Sales	288,221		255,457		793,586		739,426
Operating Income (Loss)	101,455		74,897		265,812		221,709
Depreciation, depletion and amortization	15,077		15,592		41,577		40,089
Wood Products Segment [Member]
Segment Reporting Information [Line Items]
Assets	18,716				18,716				21,264
Sales	22,825		16,492		65,864		50,239
Operating Income (Loss)	1,618		(740)		6,669		(1,274)
Depreciation, depletion and amortization	787		689		2,369		2,344
All Other Segments [Member]
Segment Reporting Information [Line Items]
Assets	23,424				23,424				24,576
Sales	26,293		25,950		76,702		94,869
Operating Income (Loss)	(419)		1,122		(201)		955
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales	(1,247)	[1]	(2,250)	[1]	(1,538)	[1]	(4,743)	[1]
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Assets	297,694				297,694				170,864
Operating Income (Loss)	(9,084)		(5,838)		(24,841)		(20,568)
All Other Segments And Unallocated Amount To Segment [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization	$ 368		$ 323		$ 1,158		$ 861

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