Income Taxes (Schedule of Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Pension and other postretirement employee benefits	$ 34,703	$ 32,110
Inventories	552	754
Tax credits	1,519	2,190
Nondeductible accruals	2,005	815
Incentive compensation	971	1,044
Employee benefits	1,323	1,316
Other	1,110	1,296
Total deferred tax assets	42,183	39,525
Valuation allowance		(395)
Deferred tax assets, net of valuation allowance	42,183	39,130
Timber and timberlands, net	(354)	(965)
Property, plant and equipment, net	(52,698)	(50,901)
Intangible assets, net	(3,656)	(3,778)
Real estate development	(1,236)	(1,402)
Other	(1,979)	(2,249)
Total deferred tax liabilities	(59,923)	(59,295)
Deferred tax liabilities, net	$ (17,740)	$ (20,165)

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Deferred tax liabilities, real estate development.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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