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Income Taxes - Deferred taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred Income Tax Assets        
Accounts receivable allowances $ 406 $ 369    
Environmental liability 12,041 12,518    
Asset retirement obligation 2,769 2,657    
Deferred financing obligation 10,247 10,639    
Lease liability 38,400 42,585    
Other 3,619 6,466    
Federal net operating loss carryforwards 5,521 11,091    
State net operating loss carryforwards 433 384    
Tax credit carryforward 1,709 1,343    
Interest expense carryforwards 16,493 8,115    
Total deferred tax assets 91,638 96,167    
Valuation allowance, noncurrent (5,323) (4,728) $ (4,231) $ (3,881)
Total deferred tax assets, net 86,315 91,439    
Deferred Income Tax Liabilities        
Property and equipment (95,823) (99,031)    
Land (17,675) (17,861)    
Right of use assets (36,797) (40,947)    
Basis difference in SPR joint venture (4,929)      
Total deferred tax liabilities (155,224) (157,839)    
Net deferred tax liabilities $ (68,909) $ (66,400)