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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Insurance accruals $ 24,304 $ 27,180
Allowance for doubtful accounts 9,270 8,052
Compensation accrual 10,809 4,925
CARES Act payroll tax deferral 19,931 0
Deferred compensation accrual 25,702 24,521
Federal benefit of state uncertain tax positions 10,312 9,867
Lease liabilities 32,625 30,251
State NOL carry-forward 8,460 7,495
Other 4,237 6,357
Total gross deferred tax assets 145,650 118,648
Valuation allowance (8,460) (7,495)
Total deferred tax assets, net of valuation allowance 137,190 111,153
Deferred tax liabilities:    
Plant and equipment, principally due to differences in depreciation 748,883 729,016
Prepaid permits and insurance, principally due to expensing for income tax purposes 42,126 39,285
Lease right-of-use assets 32,952 30,014
Other 5,251 11,916
Total gross deferred tax liabilities 829,212 810,231
Net deferred tax liability $ 692,022 $ 699,078