Revenue Recognition (Summary of Revenues by Major Product) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenues		$ 181,716	$ 199,897
Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		206,628	226,876
Intersegment Eliminations [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	(24,912)	(26,979)
Resource [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		68,158	76,506
Resource [Member] | Operating Segments [Member] | Northern Region [Member]
Disaggregation Of Revenue [Line Items]
Revenues		34,877	51,659
Resource [Member] | Operating Segments [Member] | Northern Region [Member] | Sawlogs [Member]
Disaggregation Of Revenue [Line Items]
Revenues		32,499	49,584
Resource [Member] | Operating Segments [Member] | Northern Region [Member] | Pulpwood [Member]
Disaggregation Of Revenue [Line Items]
Revenues		2,061	1,780
Resource [Member] | Operating Segments [Member] | Northern Region [Member] | Stumpage [Member]
Disaggregation Of Revenue [Line Items]
Revenues		106	79
Resource [Member] | Operating Segments [Member] | Northern Region [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues		211	216
Resource [Member] | Operating Segments [Member] | Southern Region [Member]
Disaggregation Of Revenue [Line Items]
Revenues		33,281	24,847
Resource [Member] | Operating Segments [Member] | Southern Region [Member] | Sawlogs [Member]
Disaggregation Of Revenue [Line Items]
Revenues		18,437	14,030
Resource [Member] | Operating Segments [Member] | Southern Region [Member] | Pulpwood [Member]
Disaggregation Of Revenue [Line Items]
Revenues		11,811	8,970
Resource [Member] | Operating Segments [Member] | Southern Region [Member] | Stumpage [Member]
Disaggregation Of Revenue [Line Items]
Revenues		322	391
Resource [Member] | Operating Segments [Member] | Southern Region [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues		2,711	1,456
Wood Products [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		132,306	139,815
Wood Products [Member] | Operating Segments [Member] | Lumber [Member]
Disaggregation Of Revenue [Line Items]
Revenues		90,505	94,993
Wood Products [Member] | Operating Segments [Member] | Panels [Member]
Disaggregation Of Revenue [Line Items]
Revenues		24,698	28,891
Wood Products [Member] | Operating Segments [Member] | Residuals [Member]
Disaggregation Of Revenue [Line Items]
Revenues		17,103	15,931
Real Estate Segment [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Revenues		6,164	10,555
Real Estate Segment [Member] | Operating Segments [Member] | Rural Real Estate [Member]
Disaggregation Of Revenue [Line Items]
Revenues		4,219	8,833
Real Estate Segment [Member] | Operating Segments [Member] | Development Real Estate [Member]
Disaggregation Of Revenue [Line Items]
Revenues		673	1,219
Real Estate Segment [Member] | Operating Segments [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[2]	$ 1,272	$ 503

[1] Intersegment revenues represent logs sold by our Resource segment to the Wood Products segment.

[2] Other Real Estate revenues primarily relate to the Chenal Country Club.