Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017, 2016 and 2015 (in thousands):

	2017		2016		2015
U.S.	$	94,518	$	273,176	$	233,247
Foreign	221,604		186,270		223,377
Income before provision for income taxes	$	316,122	$	459,446	$	456,624

Schedule of Provision for Income Tax

The provision for income taxes consisted of the following for the years ended December 31, 2017, 2016 and 2015 (in thousands):

	2017			2016			2015
Current tax provision (benefit):
Federal	$	41,090		$	89,816		$	70,298
State	6,336			6,238			(1,750		)
Foreign	51,244			39,952			62,572
Deferred tax provision (benefit):
Federal	(17,136		)	4,265			23,381
State	21,689			(86		)	(742		)
Foreign	(4,992		)	3,916			(18,536		)
Change in valuation allowance	(430		)	(787		)	(5		)
Total	$	97,801		$	143,314		$	135,218

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, 2017, 2016 and 2015:

	2017		2016		2015
U.S. federal income tax rate	35.0	%	35.0	%	35.0	%
State taxes	1.6		2.0		1.7
Share-based compensation	3.7		2.7		1.9
U.S. federal, state and foreign research and development credits	(6.9	)	(3.3	)	(4.1	)
Foreign earnings	(7.8	)	(3.4	)	(4.6	)
Domestic production activities deduction	(0.7	)	(1.7	)	(1.2	)
U.S Tax Cuts and Jobs Act, net	8.2		—		—
Impact of acquisition-related uncertain tax position	(2.9	)	—		—
Other	0.7		(0.1	)	0.9
	30.9	%	31.2	%	29.6	%

Net Deferred Tax and Valuation Allowance

The components of the net deferred tax assets and liabilities and the related valuation allowance as of December 31, 2017 and 2016 were as follows (in thousands):

	2017			2016
Accrued bonus	$	19,950		$	18,390
Deferred revenue	8,861			10,055
Deferred rent	8,000			12,592
Stock-based compensation	20,557			32,030
Net operating losses	26,698			7,855
Unrealized losses	1,239			1,862
Tax credit carryforwards	49,135			23,629
License income	6,611			16,932
Other	11,909			7,048
Deferred tax assets	152,960			130,393
Depreciation and amortization	(13,933		)	(10,470		)
Acquired intangible assets	(48,781		)	(44,788		)
Internal-use software development costs capitalized	(54,687		)	(77,375		)
Deferred tax liabilities	(117,401		)	(132,633		)
Valuation allowance	—			(430		)
Net deferred tax assets (liabilities)	$	35,559		$	(2,670	)

Schedule of Operating Loss Carryforwards

The table below summarizes the Company's NOL and tax credit carryforwards in federal, state, and foreign jurisdictions as of December 31, 2017 and 2016 (in thousands, except for years):

	2017		2016		Expirations at Various Dates Through:
NOL carryforwards:
Federal	$	99,200	$	16,500	2037
State	89,500		11,400		2035
Foreign	—		—		—
Federal and state research and development tax credit and other credit carryforwards	65,900		41,500		2032

Unrecognized Tax Benefits

The following is a roll forward of the Company’s unrecognized tax benefits for the years ended December 31, 2017, 2016 and 2015 (in thousands):

	2017			2016			2015
Balance at beginning of year	$	69,117		$	65,290		$	33,320
Gross increases — tax positions of prior periods	2,692			6,391			11,238
Gross increases — current period tax positions	27,163			6,252			27,043
Gross decreases — tax positions of prior periods	(277		)	(6,491		)	(5,739		)
Gross decreases — lapse of applicable statute of limitations	(12,850		)	(287		)	(257		)
Gross decreases — settlements	—			(2,038		)	(315		)
Balance at end of year	$	85,845		$	69,117		$	65,290