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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Insurance accruals | $ 27,180 | $ 34,889
Allowance for doubtful accounts | 8,052 | 7,649
Compensation accrual | 4,925 | 10,461
Deferred compensation accrual | 24,521 | 20,396
Federal benefit of state uncertain tax positions | 9,867 | 10,364
Lease liabilities | 30,251 | 0
State NOL carry-forward | 7,495 | 6,041
Other | 6,357 | 4,626
Total gross deferred tax assets | 118,648 | 94,426
Valuation allowance | (7,495) | (6,041)
Total deferred tax assets, net of valuation allowance | 111,153 | 88,385
Deferred tax liabilities: |  |
Plant and equipment, principally due to differences in depreciation | 729,016 | 696,913
Prepaid permits and insurance, principally due to expensing for income tax purposes | 39,285 | 33,594
Lease right-of-use assets | 30,014 | 0
Other | 11,916 | 1,339
Total gross deferred tax liabilities | 810,231 | 731,846
Net deferred tax liability | $ 699,078 | $ 643,461

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