Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule of Income before Income Taxes

Income before provision for income taxes was as follows:

	Year Ended December 31,
	2012		2011			2010
	(in thousands)
United States	$	27,885	$	359,786		$	267,696
Foreign	2,595		(264		)	—
Income before income taxes	$	30,480	$	359,522		$	267,696

Components Of Provision For Income Taxes

The components of provision for income taxes for all periods presented were as follows:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Current tax provision:
Federal	$	34,387		$	123,406		$	86,002
State	7,850			28,657			21,803
Foreign	1,162			(70		)	—
Total current	43,399			151,993			107,805
Deferred tax provision:
Federal	(26,903		)	(14,008		)	(1,615		)
State	(3,168		)	(4,589		)	653
Total deferred	(30,071		)	(18,597		)	(962		)
Provision for income taxes	$	13,328		$	133,396		$	106,843

Reconciliation Of Provision For Income Taxes

A reconciliation of the provision for income taxes, with the amount computed by applying the statutory federal income tax rate to income before income taxes is as follows:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Expected tax expense at U.S. federal statutory rate of 35%	$	10,667		$	125,833		$	93,694
State income taxes, net of Federal income tax effect	2,914			15,042			15,349
R&D tax credit	(1,803		)	(8,365		)	(3,207		)
Other	1,550			886			1,007
Provision for income taxes	$	13,328		$	133,396		$	106,843

Deferred Tax Assets And Liabilities

The tax effects of temporary differences and tax carryforwards that give rise to significant portions of the deferred tax assets are presented below:

	As of December 31,
	2012			2011
	(in thousands)
Deferred tax assets (liabilities):
Stock-based compensation	$	66,827		$	39,337
Accruals and reserves	11,155			9,193
Depreciation	(18,356		)	(17,381		)
R&D credits	8,480			6,335
Other	(244		)	844
Deferred tax assets	$	67,862		$	38,328

Summary Of Changes In Unrecognized Tax Benefits

The aggregate changes in the Company’s total gross amount of unrecognized tax benefits are summarized as follows (in thousands):

Balance as of December 31, 2010	$	20,677
Decreases related to tax positions taken during prior periods	(46		)
Increases related to tax positions taken during the current period	10,739
Decreases related to expiration of statute of limitations	(3,237		)
Balance as of December 31, 2011	$	28,133
Increases related to tax positions taken during prior periods	8,487
Decreases related to tax positions taken during prior periods	(320		)
Increases related to tax positions taken during the current period	7,037
Balance as of December 31, 2012	$	43,337