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Income Taxes (Summary of the Total Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets    
Lease liabilities $ 21,880 $ 24,500
Tax carryforwards 12,398 13,837
Inventories 5,571 4,522
Accrued liabilities 8,176 9,243
Employee benefits 3,086 3,496
Land valuation adjustment 6,261 5,988
Other 6,850 6,527
Total deferred tax assets 64,222 68,113
Less: Valuation allowance 11,809 11,695
Deferred tax assets, net of valuation allowance 52,413 56,418
Deferred tax liabilities    
Lease right-of-use assets 21,880 24,500
Depreciation and depletion 19,665 25,851
Partnership investment - development costs 6,069 9,840
Accrued pension benefits 10,921 10,941
Total deferred tax liabilities 58,535 71,132
Net deferred liability $ (6,122) $ (14,714)