Income Taxes (Schedule of Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Pension and other postretirement employee benefits	$ 18,098	$ 20,992
Inventories	892	753
Nondeductible accruals	1,663	2,559
Incentive compensation	1,444	1,910
Employee benefits	1,451	1,477
Other	790	706
Total deferred tax assets	24,338	28,397
Timber and timberlands, net	(1,827)	(1,852)
Property, plant and equipment, net	(51,704)	(58,464)
Intangible assets, net	(3,590)	(4,037)
Real estate development	(982)	(1,628)
Other	(2,876)	(4,206)
Total deferred tax liabilities	(60,979)	(70,187)
Deferred tax liabilities, net	$ (36,641)	$ (41,790)