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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Insurance accruals | $ 69,168 | $ 58,614
Allowance for doubtful accounts | 12,584 | 10,766
Compensation accrual | 9,882 | 8,003
Deferred compensation accrual | 26,805 | 36,309
Federal benefit of state uncertain tax positions | 17,693 | 17,491
Lease liabilities | 74,858 | 82,048
State NOL carry-forward | 4,235 | 5,478
Other | 3,815 | 3,890
Total gross deferred tax assets | 219,040 | 222,599
Valuation allowance | (4,235) | (5,478)
Total deferred tax assets, net of valuation allowance | 214,805 | 217,121
Plant and equipment, principally due to differences in depreciation | 1,001,537 | 1,057,922
Prepaid permits and insurance, principally due to expensing for income tax purposes | 35,592 | 63,880
Lease right-of-use assets | 73,925 | 81,416
Total gross deferred tax liabilities | 1,111,054 | 1,203,218
Net deferred tax liability | $ 896,249 | $ 986,097

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