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Income Taxes - Deferred taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred Income Tax Assets        
Accounts receivable allowances $ 479 $ 432    
Environmental liability 10,855 11,087    
Asset retirement obligation 2,950 2,813    
Deferred financing obligation 9,530 9,924    
Lease liability 50,344 50,152    
Other 1,581 1,108    
Federal net operating loss carryforwards 2,615 2,610    
State net operating loss carryforwards 1,750 300    
Tax credit carryforward 1,893 1,727    
Interest expense carryforwards 17,426 18,570    
Total deferred tax assets, gross 99,423 98,723    
Valuation allowance (5,902) (5,781) $ (5,323) $ (4,728)
Total deferred tax assets, net 93,521 92,942    
Deferred Income Tax Liabilities        
Property and equipment (81,525) (84,961)    
Land (16,467) (16,543)    
Right of use assets (48,961) (48,718)    
Basis difference in SPR joint venture (6,761) (5,168)    
Intangible assets (4,341) (1,100)    
Total deferred tax liabilities (158,055) (156,490)    
Net deferred tax liabilities $ (64,534) $ (63,548)