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Income Taxes (Total Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets |  |
Lease liabilities | $ 1,252 | $ 7,083
Tax carryforwards | 12,371 | 14,816
Inventories | 6,029 | 4,880
Accrued liabilities | 9,430 | 9,226
Employee benefits | 3,630 | 3,319
Land valuation adjustment | 6,489 | 6,378
Partnership investment - development costs | 14,819 | 12,565
Other | 7,866 | 9,680
Total deferred tax assets | 61,886 | 67,947
Less: Valuation allowance | 11,672 | 11,783
Deferred tax assets, net of valuation allowance | 50,214 | 56,164
Deferred tax liabilities |  |
Lease right-of-use assets | 1,209 | 7,429
Depreciation and depletion | 23,731 | 23,607
Accrued pension benefits | 10,633 | 10,047
Total deferred tax liabilities | 35,573 | 41,083
Net deferred asset | $ 14,641 | $ 15,081

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