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Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		Years ended December 31,
		2020				2019				2018
Current:
Federal		$	138,952			$	87,977			$	22,904
State and local			28,094				20,981				26,738
			167,046				108,958				49,642
Deferred:
Federal			(2,392	)			51,229				97,670
State and local			(4,664	)			4,388				3,921
			(7,056	)			55,617				101,591
Total tax expense/(benefit)		$	159,990			$	164,575			$	151,233

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		Years ended December 31,
		2020				2019				2018
Income tax at federal statutory rate		$	139,865			$	142,988			$	134,572
State tax, net of federal effect			20,071				19,293				24,627
Federal tax reform			-				-				(3,219	)
Benefit of stock compensation			(3,503	)			(1,238	)			(4,919	)
199/R&D credit			-				(200	)			1,000
Nondeductible meals and entertainment			1,344				1,688				1,071
Change in effective state tax rate, net of federal benefit			98				1,562				(1,469	)
Other, net			2,115				482				(430	)
Total tax expense		$	159,990			$	164,575			$	151,233

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		December 31,
		2020				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				-
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

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

		December 31,
		2020				2019				2018
Beginning balance		$	50.6			$	52.2			$	45.3
Additions based on tax positions related to the current year			9.8				11.0				13.9
Additions/(reductions) based on tax positions taken in prior years			13.9				(6.5	)			(2.4	)
Reductions due to settlements			(1.0	)			-				-
Reductions due to lapse of applicable statute of limitations			(7.2	)			(6.1	)			(4.6	)
Ending balance		$	66.1			$	50.6			$	52.2

X

- Definition

Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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