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Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

		Years ended December 31,
		2016				2015				2014
Current:
Federal		$	191,422			$	160,235			$	130,761
State and local			21,871				22,306				19,705
			213,293				182,541				150,466
Deferred:
Federal			45,846				71,292				72,547
State and local			4,568				9,135				6,796
			50,414				80,427				79,343
Total tax expense		$	263,707			$	262,968			$	229,809

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

		Years ended December 31,
		2016				2015				2014
Income tax at federal statutory rate		$	243,529			$	241,571			$	211,610
State tax, net of federal effect			19,165				18,671				17,357
Nondeductible meals and entertainment			1,419				1,420				1,395
Change in effective state tax rate, net of federal benefit			(1,055	)			1,761				256
Other, net			649				(455	)			(809	)
Total tax expense		$	263,707			$	262,968			$	229,809

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

		December 31,
		2016				2015
Deferred tax assets:
Insurance accruals		$	34,788			$	33,522
Allowance for doubtful accounts			2,347				2,335
Compensation accrual			10,443				13,991
Deferred compensation accrual			26,062				24,687
Federal benefit of state uncertain tax positions			14,085				12,751
Other			3,853				4,036
Total gross deferred tax assets			91,578				91,322
Valuation allowance			-				(552	)
Total deferred tax assets, net of valuation allowance			91,578				90,770
Deferred tax liabilities:
Plant and equipment, principally due to differences in depreciation			831,555				786,840
Prepaid permits and insurance, principally due to expensing for income tax purposes			37,119				33,064
Other			13,538				11,086
Total gross deferred tax liabilities			882,212				830,990
Net deferred tax liability		$	790,634			$	740,220

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

		December 31,
		2016				2015				2014
Beginning balance		$	32.0			$	31.6			$	29.7
Additions based on tax positions related to the current year			10.3				9.4				8.2
Additions/(reductions) based on tax positions taken in prior years			(3.2	)			(2.5	)			0.4
Reductions due to settlements			(0.4	)			(3.0	)			(3.7	)
Reductions due to lapse of applicable statute of limitations			(3.3	)			(3.5	)			(3.0	)
Ending balance		$	35.4			$	32.0			$	31.6

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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.

+ References

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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.

+ References

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Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination.

+ References

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