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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015, 2014 and 2013 are as follows (in thousands):

		2015				2014				2013
Federal income tax expense (benefit):
Current		$	(42,020	)		$	39,438			$	41,558
Deferred			(83,812	)			39,673				47,136
			(125,832	)			79,111				88,694
State income tax expense (benefit):
Current			(3,480	)			3,987				11,733
Deferred			(12,433	)			5,292				4,229
			(15,913	)			9,279				15,962
Foreign income tax expense (benefit):
Current			(2,590	)			4,521				4,572
Deferred			(3,628	)			(1,292	)			(796	)
			(6,218	)			3,229				3,776
Total income tax expense (benefit):
Current			(48,090	)			47,946				57,863
Deferred			(99,873	)			43,673				50,569
Total income tax expense (benefit):		$	(147,963	)		$	91,619			$	108,432

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, 2015, 2014 and 2013 is summarized as follows:

		2015				2014				2013
Statutory tax rate			35.0	%			35.0	%			35.0	%
State income taxes			2.1				2.5				3.7
Permanent differences			(1.3	)			(1.4	)			(1.5	)
Other differences, net			(2.4	)			(0.1	)			(0.6	)
Effective tax rate			33.4	%			36.0	%			36.6	%

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,
		2015				Change				2014				Change				2013				Change				2012
Deferred tax assets:
Current:
Net operating loss carryforwards		$	27,887			$	27,887			$	—			$	—			$	—			$	(18,914	)		$	18,914
Workers’ compensation allowance			28,734				424				28,310				698				27,612				2,534				25,078
Other			21,305				(1,091	)			22,396				2,749				19,647				(804	)			20,451
			77,926				27,220				50,706				3,447				47,259				(17,184	)			64,443
Non-current:
Net operating loss carryforwards			77,514				65,050				12,464				(988	)			13,452				1,690				11,762
Expense associated with employee stock options			14,591				205				14,386				(1,822	)			16,208				1,536				14,672
Federal benefit of state deferred tax liabilities			24,485				466				24,019				1,181				22,838				816				22,022
Other			20,441				4,394				16,047				1,344				14,703				(421	)			15,124
			137,031				70,115				66,916				(285	)			67,201				3,621				63,580
Less:
Allowance to reduce deferred tax asset to expected realizable value			(603	)			(603	)			—				—				—				—				—
Total deferred tax assets			214,354				96,732				117,622				3,162				114,460				(13,563	)			128,023
Deferred tax liabilities:
Current:
Other			(12,805	)			826				(13,631	)			676				(14,307	)			(2,823	)			(11,484	)
Non-current:
Property and equipment basis difference			(986,922	)			31				(986,953	)			(47,359	)			(939,594	)			(33,997	)			(905,597	)
Other			(13,339	)			2,284				(15,623	)			(152	)			(15,471	)			(186	)			(15,285	)
			(1,000,261	)			2,315				(1,002,576	)			(47,511	)			(955,065	)			(34,183	)			(920,882	)
Total deferred tax liabilities			(1,013,066	)			3,141				(1,016,207	)			(46,835	)			(969,372	)			(37,006	)			(932,366	)
Net deferred tax liability		$	(798,712	)		$	99,873			$	(898,585	)		$	(43,673	)		$	(854,912	)		$	(50,569	)		$	(804,343	)

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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