Income Taxes (Schedule of Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Pension and other postretirement employee benefits	$ 20,992	$ 22,610
Inventories	753	387
Nondeductible accruals	2,559	1,634
Incentive compensation	1,910	1,437
Employee benefits	1,477	1,444
Other	706	598
Total deferred tax assets	28,397	28,110
Timber and timberlands, net	(1,852)	(226)
Property, plant and equipment, net	(58,464)	(53,800)
Intangible assets, net	(4,037)	(3,466)
Real estate development	(1,628)	(2,476)
Other	(4,206)	(3,016)
Total deferred tax liabilities	(70,187)	(62,984)
Deferred tax liabilities, net	$ (41,790)	$ (34,874)