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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