Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense (benefit) for the years ended December 31, 2013 and 2012 consists of the following:



		2013			2012
Current:
	Federal	$	201,475		—
	State	23,489			$	4,308
	Foreign	433			—
	Total current tax expense (benefit)	225,397			4,308
Deferred:
	Federal	54,910			(300,319		)
	State	8,700			(39,837		)
	Foreign	(9		)	—
	Total deferred tax expense (benefit)	63,601			(340,156		)
Total income tax expense (benefit)		$	288,998		$	(335,848	)

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the U.S. statutory income tax rate to the Company's effective income tax rate is as follows:



	2013		2012
U.S. federal statutory tax rate	35.0	%	35.0	%
State and local income taxes	3.4		5.4
Change in state effective rate	—		5.4
Other non-deductible and permanent differences	2.1		2.8
Foreign income tax rate differential	4.9		—
Income tax credits	(4.9	)	—
Reclassification of net operating losses related to exercises of stock options	—		9.3
Provision (benefit) attributable to valuation allowances	—		(139.0	)
Effective income tax rate	40.5	%	(81.1	)%

Schedule of Deferred Tax Assets and Liabilities

Significant components of the Company's deferred tax assets and liabilities are as follows:



	As of December 31,
	2013			2012
Deferred tax assets:
Net operating loss carry-forward	$	135		$	77,119
Fixed assets	18,902			1,380
Deferred revenue	88,033			99,659
Deferred compensation	109,715			53,367
Income tax credit carry-forwards	9,372			71,164
Capitalized research and development costs	18,942			24,437
Other	34,215			23,511
	279,314			350,637
Valuation allowance	(1,830		)	(2,486		)
Total deferred tax assets	277,484			348,151

Deferred tax liabilities:
Accruals	—			(6,824		)
Convertible senior notes	(929		)	(1,171		)
	(929		)	(7,995		)

Net deferred tax assets	$	276,555		$	340,156

Schedule Of Unrecognized Tax Benefits Roll Forward

The following table summarizes the gross amounts of unrecognized tax benefits, without regard to reduction in tax liabilities or additions to deferred tax assets and liabilities if such unrecognized tax benefits were settled. The amount, if recognized, that would impact the effective tax rate is $23.5 million, $8.4 million, and $4.2 million as of December 31, 2013, 2012, and 2011, respectively.



	2013			2012		2011
Balance as of January 1	$	11,274		$	5,596	$	12,819
Gross increases related to current year tax positions	7,620			1,873		2,192
Gross increases related to prior year tax positions	8,305			3,805		—
Gross decrease due to settlements, recapture, filed returns, and lapse of statutes of limitation	(572		)	—		(9,415		)
Balance as of December 31	$	26,627		$	11,274	$	5,596