Summary of Significant Accounting Policies (Narrative) (Details) a in Millions		1 Months Ended	12 Months Ended
	Sep. 14, 2022 USD ($) shares	Nov. 30, 2023 USD ($)	Dec. 31, 2024 USD ($) a Customer shares	Dec. 31, 2023 USD ($) Customer shares	Dec. 31, 2022 USD ($) Customer
Principle Accounting Policies [Line Items]
Timber And Timberlands Acres Owned | a			2.1
Gross carrying amount of long-lived intangible assets			$ 11,400,000	$ 11,400,000
Accumulated amortization			7,700,000	6,000,000
Intangible asset acquired			0
Indefinite-lived intangible assets, trade names			10,200,000	10,200,000
Impairment of intangible assets			$ 0	$ 0	$ 0
Common stock, issued | shares			78,684,000	79,365,000
Outstanding long-term debt			$ 1,034,652,000	$ 1,033,728,000
CatchMark merger-related expenses			$ 0	$ 2,453,000	$ 27,325,000
Number of customers more than 10% of revenue | Customer			0	0	0
Defined benefit obligation of plan assets description			amortization of cumulative unrecognized net actuarial gains and losses – generally in excess of 10 percent of the greater of the benefit obligation or market-related value of plan assets at the beginning of the year – over the average remaining service period of the active employee group covered by the plan.
ASU 2023-07 [Member]
Principle Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Adoption Date			Jan. 01, 2024
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
Thomson Reservoir Sediment Remediation Project [Member]
Principle Accounting Policies [Line Items]
Accrued amount			$ 2,200,000	$ 2,200,000	$ 5,600,000
Payment for initial share of project costs		$ 3,400,000	0		0
CatchMark [Member]
Principle Accounting Policies [Line Items]
Common stock, issued | shares	11,300,000
Fair value of assets acquired	$ 23,600,000
Liabilities assumed	323,100,000
Outstanding long-term debt	300,000,000
CatchMark merger-related expenses			0	2,500,000	27,300,000
CatchMark [Member] | Intangible Assets [Member]
Principle Accounting Policies [Line Items]
Fair value of assets acquired	$ 3,000,000
CatchMark Timber Operating Partnership, LP [Member]
Principle Accounting Policies [Line Items]
Common stock, issued | shares	200,000
CatchMark and CatchMark Timber Operating Partnership, LP [Member]
Principle Accounting Policies [Line Items]
Common stock, issued | shares	11,500,000
Transaction costs capitalized	$ 9,300,000
Designated as Hedging Instrument [Member]
Principle Accounting Policies [Line Items]
Derivative Fair Value Of Derivative Net			0	0
Customer Relationships [Member]
Principle Accounting Policies [Line Items]
Intangible asset acquired					3,000,000
Customer Relationships and Trade Names [Member]
Principle Accounting Policies [Line Items]
Amortization expense			$ 1,800,000	$ 1,800,000	$ 1,100,000
Intangible Assets, Amortization Period [Member] | Customer Relationships [Member]
Principle Accounting Policies [Line Items]
Finite-lived intangible asset, useful life			3 years
Intangible Assets, Amortization Period [Member] | Trade Names [Member]
Principle Accounting Policies [Line Items]
Finite-lived intangible asset, useful life			20 years
Minimum [Member]
Principle Accounting Policies [Line Items]
Operating leases, options to extend leases term			1 year
Minimum [Member] | Thomson Reservoir Sediment Remediation Project [Member]
Principle Accounting Policies [Line Items]
Share of total project cost			$ 5,600,000
Maximum [Member]
Principle Accounting Policies [Line Items]
Operating leases, options to extend leases term			5 years
Maximum [Member] | Thomson Reservoir Sediment Remediation Project [Member]
Principle Accounting Policies [Line Items]
Share of total project cost			$ 6,700,000
Timber and Timberlands [Member] | CatchMark and CatchMark Timber Operating Partnership, LP [Member]
Principle Accounting Policies [Line Items]
Fair value of assets acquired	782,300,000
Timber and Timberlands [Member] | Minimum [Member]
Principle Accounting Policies [Line Items]
Timber volume estimate, review period			5 years
Property, plant and equipment, useful life			5 years
Timber and Timberlands [Member] | Maximum [Member]
Principle Accounting Policies [Line Items]
Timber volume estimate, review period			10 years
Property, plant and equipment, useful life			20 years
Other Assets [Member] | CatchMark [Member]
Principle Accounting Policies [Line Items]
Fair value of assets acquired	$ 32,000,000