Segment Information (Summary of Information by Business Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Adjusted EBITDDA		$ 101,090	$ 107,183	$ 521,822	$ 577,153
Interest expense, net	[1]	(8,280)	(8,641)	(18,593)	(20,414)
Depreciation, depletion and amortization		(27,329)	(21,131)	(66,838)	(56,156)
Basis of real estate sold		(6,845)	(6,697)	(25,024)	(22,733)
CatchMark merger-related expenses		(26,007)	0	(26,007)	0
Gain on fire damage		24,913	4,394	34,505	4,394
Pension settlement charge		0	0	(14,165)	0
Non-operating pension and other postretirement employee benefits		(1,808)	(3,271)	(5,546)	(9,956)
Gain (loss) on disposal of fixed assets		(23)	1,139	39	(1,700)
Other		(1)	0	(1)	0
Income before income taxes		55,756	70,698	400,192	470,588
Bond discounts and deferred loan fees	[1]	378	403	1,122	1,209
Total depreciation, depletion and amortization		27,707	21,534	67,960	57,365
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization		27,329	21,131	66,838	56,156
Operating Segments [Member] | Timberlands [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		64,482	76,023	198,806	221,140
Depreciation, depletion and amortization		16,963	11,893	40,687	33,792
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		31,258	26,566	288,465	356,654
Depreciation, depletion and amortization		10,069	8,879	25,226	21,261
Operating Segments [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		14,140	9,069	66,080	37,450
Depreciation, depletion and amortization		175	162	518	477
Basis of real estate sold		(6,845)	(6,703)	(25,033)	(22,751)
Corporate [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		(12,629)	(11,496)	(36,125)	(35,028)
Depreciation, depletion and amortization		122	197	407	626
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDDA		(3,839)	7,021	4,596	(3,063)
Basis of real estate sold		$ 0	$ 6	$ 9	$ 18

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