Segment Information (Summary of Information by Business Segment) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Adjusted EBITDDA		$ 57,777	$ 245,562
Interest expense, net	[1]	(199)	(2,894)
Depreciation, depletion and amortization		(31,764)	(19,502)
Basis of real estate sold		(10,631)	(10,854)
CatchMark merger-related expenses		(2,209)	0
Loss on fire damage		0	(276)
Pension settlement charge		0	(14,165)
Non-operating pension and other postretirement employee benefit costs		(228)	(1,929)
Gain on disposal of fixed assets		0	3
Other		10	0
Income before income taxes		12,756	195,945
Bond discounts and deferred loan fees	[1]	409	372
Total depreciation, depletion and amortization		32,173	19,874
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		31,764	19,502
Operating Segments [Member] | Timberlands [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		46,639	76,434
Depreciation, depletion and amortization		20,461	12,161
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		11,035	7,021
Depreciation, depletion and amortization		(31)	149,951
Operating Segments [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		19,465	30,124
Depreciation, depletion and amortization		156	170
Basis of real estate sold		10,631	10,860
Corporate [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		(10,741)	(9,584)
Depreciation, depletion and amortization		112	150
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		2,445	(1,363)
Basis of real estate sold		$ 0	$ (6)

[1] Bond discounts and deferred loan fees are reported within interest expense, net on the Condensed Consolidated Statements of Operations.