Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Components of Income Before Tax

The components of income before provision (benefit) for income taxes were as follows for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	2018			2017		2016
U.S.	$	(27,379	)	$	92,588	$	280,092
Foreign	370,468			221,604		186,270
Income before provision for income taxes	$	343,089		$	314,192	$	466,362

Schedule of Provision for Income Tax

The provision for income taxes consisted of the following for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	2018			2017			2016
Current tax provision (benefit):
Federal	$	(29,982	)	$	41,090		$	89,816
State	8,085			6,336			6,238
Foreign	64,274			51,244			39,952
Deferred tax provision (benefit):
Federal	5,954			(24,136		)	6,903
State	701			21,689			(86		)
Foreign	(7,140		)	(4,367		)	3,599
Change in valuation allowance	2,824			(430		)	(787		)
Total	$	44,716		$	91,426		$	145,635

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, 2018, 2017 and 2016:

	2018		2017		2016
U.S. federal income tax rate	21.0	%	35.0	%	35.0	%
State taxes	1.2		1.5		2.0
Share-based compensation	1.0		3.7		2.7
U.S. federal, state and foreign research and development credits	(7.6	)	(7.0	)	(3.3	)
Foreign earnings	(6.0	)	(7.9	)	(3.4	)
Domestic production activities deduction	—		(0.7	)	(1.7	)
Impact of TCJA, net	(0.8	)	6.4		—
Impact of acquisition-related uncertain tax position	—		(2.9	)	—
Intercompany sale of intellectual property	3.3		—		—
Other	0.9		1.0		(0.1	)
	13.0	%	29.1	%	31.2	%

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, 2018 and 2017 were as follows (in thousands):

	2018			2017
Accrued bonus	$	24,093		$	19,950
Deferred revenue	4,188			6,460
Deferred rent	11,245			8,000
Stock-based compensation	20,345			20,557
NOLs	15,743			26,698
Unrealized losses	1,039			1,239
Tax credit carryforwards	70,235			49,135
License income	2,245			6,611
Other	16,483			11,909
Deferred tax assets	165,616			150,559
Depreciation and amortization	(23,912		)	(13,933		)
Acquired intangible assets	(45,773		)	(48,781		)
Deferred commissions	(14,232		)	(14,750		)
Internal-use software development costs capitalized	(63,586		)	(54,687		)
Deferred tax liabilities	(147,503		)	(132,151		)
Valuation allowance	(2,824		)	—
Net deferred tax assets	$	15,289		$	18,408

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, 2018 and 2017 (in thousands, except for years):

	2018		2017		Expirations at Various Dates Through:
NOL carryforwards:
Federal	$	52,500	$	99,200	2038
State	20,500		89,500		2038
Foreign	8,500		—		—
Federal and state research and development tax credit and other credit carryforwards	88,200		65,900		2033

Unrecognized Tax Benefits

The following is a roll forward of the Company’s unrecognized tax benefits for the years ended December 31, 2018, 2017 and 2016 (in thousands):

	2018			2017			2016
Balance at beginning of year	$	85,845		$	69,117		$	65,290
Gross increases — tax positions of prior periods	2,704			2,692			6,391
Gross increases — current period tax positions	3,021			27,163			6,252
Gross decreases — tax positions of prior periods	(15,287		)	(277		)	(6,491		)
Gross decreases — lapse of applicable statute of limitations	(6,186		)	(12,850		)	(287		)
Gross decreases — settlements	(5,205		)	—			(2,038		)
Balance at end of year	$	64,892		$	85,845		$	69,117