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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Components of Income Tax Provision

Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):

		2014				2013				2012
Federal income tax expense (benefit):
Current		$	39,438			$	41,558			$	(512	)
Deferred			39,673				47,136				156,003
			79,111				88,694				155,491
State income tax expense:
Current			3,987				11,733				12,455
Deferred			5,292				4,229				5,483
			9,279				15,962				17,938
Foreign income tax expense (benefit):
Current			4,521				4,572				3,817
Deferred			(1,292	)			(796	)			(1,050	)
			3,229				3,776				2,767
Total income tax expense:
Current			47,946				57,863				15,760
Deferred			43,673				50,569				160,436
Total income tax expense:		$	91,619			$	108,432			$	176,196

Difference Between Statutory Federal Income Tax Rate and Effective Income Tax Rate

The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2014, 2013 and 2012 is summarized as follows:

		2014				2013				2012
Statutory tax rate			35.0	%			35.0	%			35.0	%
State income taxes			2.5				3.7				2.5
Permanent differences			(1.4	)			(1.5	)			(0.2	)
Other, net			(0.1	)			(0.6	)			(0.3	)
Effective tax rate			36.0	%			36.6	%			37.0	%

Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities

The tax effect of significant temporary differences representing deferred tax assets and liabilities and changes therein were as follows (in thousands):

		December 31,				Net				December 31,				Net				December 31,				Net				December 31,
		2014				Change				2013				Change				2012				Change				2011
Deferred tax assets:
Current:
Net operating loss carryforwards		$	—			$	(—	)		$	—			$	(18,914	)		$	18,914			$	(95,662	)		$	114,576
Workers’ compensation allowance			28,310				698				27,612				2,534				25,078				1,074				24,004
Other			22,396				2,749				19,647				(804	)			20,451				1,651				18,800
			50,706				3,447				47,259				(17,184	)			64,443				(92,937	)			157,380
Non-current:
Net operating loss carryforwards			12,464				(988	)			13,452				1,690				11,762				(6,672	)			18,434
Expense associated with employee stock options			14,386				(1,822	)			16,208				1,536				14,672				1,944				12,728
Federal benefit of state deferred tax liabilities			24,019				1,181				22,838				816				22,022				1,762				20,260
Other			16,047				1,344				14,703				(421	)			15,124				4,454				10,670
			66,916				(285	)			67,201				3,621				63,580				1,488				62,092
Total deferred tax assets			117,622				3,162				114,460				(13,563	)			128,023				(91,449	)			219,472
Deferred tax liabilities:
Current:
Other			(13,631	)			676				(14,307	)			(2,823	)			(11,484	)			3,171				(14,655	)
Non-current:
Property and equipment basis difference			(986,953	)			(47,359	)			(939,594	)			(33,997	)			(905,597	)			(69,774	)			(835,823	)
Other			(15,623	)			(152	)			(15,471	)			(186	)			(15,285	)			(2,384	)			(12,901	)
			(1,002,576	)			(47,511	)			(955,065	)			(34,183	)			(920,882	)			(72,158	)			(848,724	)
Total deferred tax liabilities			(1,016,207	)			(46,835	)			(969,372	)			(37,006	)			(932,366	)			(68,987	)			(863,379	)
Net deferred tax liability		$	(898,585	)		$	(43,673	)		$	(854,912	)		$	(50,569	)		$	(804,343	)		$	(160,436	)		$	(643,907	)

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 10

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