Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Components of Income Before Tax

The components of income before provision for income taxes were as follows for the years ended December 31, 2015, 2014 and 2013 (in thousands):

	2015		2014		2013
U.S.	$	233,247	$	408,391	$	365,821
Foreign	223,377		71,385		53,733
Income before provision for income taxes	$	456,624	$	479,776	$	419,554

Schedule of Provision for Income Tax

The provision for income taxes consisted of the following for the years ended December 31, 2015, 2014 and 2013 (in thousands):

	2015			2014			2013
Current tax provision (benefit):
Federal	$	70,298		$	153,471		$	77,671
State	(1,750		)	4,978			8,034
Foreign	62,572			13,259			13,019
Deferred tax provision (benefit):
Federal	23,381			(13,073		)	24,210
State	(742		)	(15,220		)	(1,106		)
Foreign	(18,536		)	2,442			1,869
Change in valuation allowance	(5		)	(29		)	2,370
Total	$	135,218		$	145,828		$	126,067

Schedule of Difference Between Effective and Statutory

The Company’s effective rate differed from the U.S. federal statutory rate as follows for the years ended December 31, 2015, 2014 and 2013:

	2015		2014		2013
U.S. federal income tax rate	35.0	%	35.0	%	35.0	%
State taxes	1.7		2.3		3.4
Nondeductible stock-based compensation	1.9		1.4		0.8
U.S. federal, state and foreign research and development credits	(4.1	)	(3.2	)	(3.5	)
Foreign earnings	(4.6	)	(1.9	)	(2.6	)
Domestic production activities deduction	(1.2	)	(2.2	)	(4.3	)
State software development activities benefit	—		(2.4	)	—
Other	0.9		1.4		1.2
	29.6	%	30.4	%	30.0	%

Net Deferred Tax and Valuation Allowance

The components of the net deferred tax asset and the related valuation allowance as of December 31, 2015 and 2014 were as follows (in thousands):

	2015			2014
Accrued bonus	$	13,161		$	19,572
Deferred revenue	11,334			9,536
Deferred rent	13,224			10,518
Stock-based compensation	31,705			27,538
Net operating losses	8,855			11,466
Unrealized losses	1,421			748
Tax credit carryforwards	22,918			18,066
Other	5,989			6,528
Deferred tax assets	108,607			103,972
Depreciation and amortization	(10,848		)	(14,868		)
Acquired intangible assets	(37,923		)	(40,126		)
Internal-use software development costs capitalized	(66,807		)	(39,396		)
Deferred tax liabilities	(115,578		)	(94,390		)
Valuation allowance	(1,217		)	(1,222		)
Net deferred tax (liabilities) assets	$	(8,188	)	$	8,360

Schedule of Operating Loss Carryforwards

As of December 31, 2015 and 2014, the Company had the following NOL and credit carryforwards (in thousands):

	2015		2014		Expirations at Various Dates Through:
NOL carryforwards:
Federal	$	21,500	$	26,100	2029
State	28,200		45,000		2034
Foreign	—		300
Federal and state research and development tax credit carryforwards	39,800		30,500		2030

Unrecognized Tax Benefits

The following is a rollforward of the Company’s unrecognized tax benefits for the years ended December 31, 2015, 2014 and 2013 (in thousands):

	2015			2014			2013
Balance at beginning of year	$	33,320		$	24,651		$	20,902
Gross increases — tax positions of prior periods	11,238			12,925			2,878
Gross increases — current-period tax positions	27,043			2,106			2,834
Gross decreases — tax positions of prior periods	(5,996		)	(6,362		)	(1,213		)
Gross decreases — settlements	(315		)	—			(750		)
Balance at end of year	$	65,290		$	33,320		$	24,651