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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

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, 2012, 2011 and 2010 are as follows (in thousands):

		2012				2011				2010
Federal income tax expense (benefit):
Current		$	(512	)		$	16,336			$	(77,310	)
Deferred			156,003				146,842				145,198
			155,491				163,178				67,888
State income tax expense:
Current			12,455				6,056				19
Deferred			5,483				13,196				3,246
			17,938				19,252				3,265
Foreign income tax expense (benefit):
Current			3,817				6,579				2,657
Deferred			(1,050	)			(1,071	)			(954	)
			2,767				5,508				1,703
Total income tax expense (benefit):
Current			15,760				28,971				(74,634	)
Deferred			160,436				158,967				147,490
Total income tax expense:		$	176,196			$	187,938			$	72,856

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, 2012, 2011 and 2010 is summarized as follows:

		2012				2011				2010
Statutory tax rate			35.0	%			35.0	%			35.0	%
State income taxes			2.5				2.5				1.1
Permanent differences			(0.2	)			(0.1	)			2.3
Other, net			(0.3	)			(0.6	)			(0.2	)
Effective tax rate			37.0	%			36.8	%			38.2	%

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, 2012				Net Change				December  31, 2011				Net Change				December  31, 2010				Net Change				December  31, 2009
Deferred tax assets:
Current:
Net operating loss carryforwards		$	18,914			$	(95,662	)		$	114,576			$	114,576			$	—			$	—			$	—
Workers’ compensation allowance			25,078				1,074				24,004				714				23,290				(1,334	)			24,624
Other			20,451				1,651				18,800				146				18,654				(962	)			19,616
			64,443				(92,937	)			157,380				115,436				41,944				(2,296	)			44,240
Non-current:
Net operating loss carryforwards			11,762				(6,672	)			18,434				11,969				6,465				1,593				4,872
Expense associated with employee stock options			14,672				1,944				12,728				1,476				11,252				2,123				9,129
Federal benefit of foreign deferred tax liabilities			—				—				—				—				—				(9,160	)			9,160
Federal benefit of state deferred tax liabilities			22,022				1,762				20,260				7,105				13,155				3,383				9,772
Other			15,124				4,454				10,670				(5,361	)			16,031				6,546				9,485
			63,580				1,488				62,092				15,189				46,903				4,485				42,418
Total deferred tax assets			128,023				(91,449	)			219,472				130,625				88,847				2,189				86,658
Deferred tax liabilities:
Current:
Other			(11,484	)			3,171				(14,655	)			474				(15,129	)			(3,766	)			(11,363	)
Non-current:
Property and equipment basis difference			(905,597	)			(69,774	)			(835,823	)			(289,168	)			(546,655	)			(133,542	)			(413,113	)
Other			(15,285	)			(2,384	)			(12,901	)			(1,231	)			(11,670	)			(709	)			(10,961	)
			(920,882	)			(72,158	)			(848,724	)			(290,399	)			(558,325	)			(134,251	)			(424,074	)
Total deferred tax liabilities			(932,366	)			(68,987	)			(863,379	)			(289,925	)			(573,454	)			(138,017	)			(435,437	)
Net deferred tax liability		$	(804,343	)		$	(160,436	)		$	(643,907	)		$	(159,300	)		$	(484,607	)		$	(135,828	)		$	(348,779	)

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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- Definition

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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- Definition

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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