Segment Information (Summary of Information by Business Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Adjusted EBITDDA		$ 574,155	$ 652,871	$ 382,228
Interest expense, net	[1]	(27,400)	(29,275)	(29,463)
Depreciation, depletion and amortization		(96,700)	(75,633)	(76,261)
Basis of real estate sold		(29,921)	(27,360)	(25,348)
Environmental charge		(5,550)	0	0
CatchMark merger-related expenses		(27,325)	0	0
Gain on fire damage		34,505	3,361	0
Pension settlement charge		(14,165)	0	(42,988)
Non-operating pension and other postretirement employee benefits		(8,138)	(13,227)	(14,226)
(Loss) gain on fixed assets		(82)	(1,721)	11
Other		(67)	(0)	(0)
Income before income taxes		399,312	509,016	193,953
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		96,700	75,633	76,261
Operating Segments [Member] | Timberlands [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		249,373	262,944	182,802
Depreciation, depletion and amortization		59,532	45,403	51,047
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		290,907	393,858	176,095
Depreciation, depletion and amortization		35,953	28,802	23,611
Operating Segments [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		73,258	47,457	86,476
Depreciation, depletion and amortization		695	640	620
Basis of real estate sold		(29,932)	(27,381)	(25,990)
Corporate [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		(49,314)	(47,393)	(48,451)
Depreciation, depletion and amortization		520	788	983
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		9,931	(3,995)	(14,694)
Basis of real estate sold		$ 11	$ 21	$ 642

[1] Includes amortization of bond discounts and deferred loan fees.