Segment Information (Summary Of Information By Business Segment) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Segment Revenues		$ 155,681	$ 174,027	$ 141,495	$ 127,896	$ 137,989	$ 174,475	$ 128,747	$ 134,125	$ 599,099	$ 575,336	$ 606,950
Operating income		25,716	$ 38,994	$ (34,228)	$ 5,072	9,855	$ 27,714	$ 7,311	$ 14,027	35,554	58,907	132,506
Interest expense, net										(28,941)	(32,761)	(22,909)
Income before income taxes										6,613	26,146	109,597
Depreciation, depletion and amortization										34,190	38,105	26,749
Bond discount and deferred loan fees										1,979	1,481	1,360
Basis of real estate sold										8,011	7,012	8,646
Assets		927,681				1,016,612				927,681	1,016,612	1,031,746
Capital Expenditures	[1]									19,288	32,732	24,232
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment Revenues										656,193	629,078	669,280
Operating income										74,009	91,247	164,173
Depreciation, depletion and amortization										31,451	35,673	24,082
Assets		813,707				968,733				813,707	968,733	966,547
Capital Expenditures	[1]									18,913	32,163	23,667
Operating Segments [Member] | Resource [Member]
Segment Reporting Information [Line Items]
Segment Revenues										256,163	263,875	252,581
Operating income										81,918	76,350	84,976
Depreciation, depletion and amortization										24,090	28,807	17,847
Capital Expenditures	[1]									13,311	13,497	10,985
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Segment Revenues										367,426	336,214	376,239
Operating income										24,587	(5,235)	52,442
Depreciation, depletion and amortization										7,357	6,810	6,176
Assets		150,855				131,103				150,855	131,103	118,674
Capital Expenditures	[1]									5,491	18,482	12,551
Operating Segments [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
Segment Revenues										32,604	28,989	40,460
Operating income	[2]									(29,495)	16,849	26,945
Depreciation, depletion and amortization										4	56	59
Basis of real estate sold										8,518	7,394	9,355
Capital Expenditures	[1]									111	184	131
Operating Segments [Member] | Resource and Real Estate [Member]
Segment Reporting Information [Line Items]
Assets	[3]	662,852				837,630				662,852	837,630	847,873
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Revenues	[4]									(57,094)	(53,742)	(62,330)
Operating income										(3,001)	3,283	(190)
Basis of real estate sold										(507)	(382)	(709)
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income										(38,455)	(32,340)	(31,667)
Depreciation, depletion and amortization										760	951	1,307
Assets		$ 113,974				$ 47,879				113,974	47,879	65,199
Capital Expenditures	[1]									$ 375	$ 569	$ 565

[1] Excludes the acquisition of timber and timberlands.

[2] In the second quarter of 2016, we sold approximately 172,000 acres of timberlands located in central Idaho for $114 million at a loss of $48.5 million before taxes.

[3] Assets are shown on a combined basis for the Resource and Real Estate segments, as we do not report assets separately to management for these segments.

[4] Intersegment revenues are based on prevailing market prices of logs sold by our Resource segment to the Wood Products segment.