Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Income Before Income Taxes

Income before income taxes and the provision for income taxes consisted of the following:

	Year Ended December 31,
	2017		2016		2015
	(In thousands)
United States	$	57,989	$	88,748	$	88,681
International	32,725		26,321		(3,117		)
Total	$	90,714	$	115,069	$	85,564

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2017			2016			2015
	(In thousands)
Current:
U.S. Federal	$	40,532		$	33,267		$	30,970
State	4,463			2,693			3,139
Foreign	4,305			6,278			6,105
	49,300			42,238			40,214
Deferred:
U.S. Federal	23,005			(2,052		)	(2,645		)
State	(288		)	441			134
Foreign	(739		)	(1,409		)	(723		)
	21,978			(3,020		)	(3,234		)
Total	$	71,278		$	39,218		$	36,980

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Net deferred tax assets consisted of the following:

	Year Ended December 31,
	2017			2016
	(In thousands)
Deferred Tax Assets:
Accruals and allowances	$	23,661		$	32,303
Net operating loss carryforwards	3,317			6,358
Stock-based compensation	6,015			8,250
Deferred rent	1,977			3,002
Deferred revenue	2,740			1,957
Tax credit carryforwards	974			1,543
Acquired intangibles	14,907			21,871
Depreciation and amortization	1,185			1,160
Total deferred tax assets	54,776			76,444
Deferred Tax Liabilities:
Depreciation and amortization	—			—
Other	(126		)	(991		)
Total deferred tax liabilities	(126		)	(991		)
Valuation Allowance (1)	(5,182		)	(4,594		)
Net deferred tax assets	$	49,468		$	70,859

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The effective tax rate differs from the applicable U.S. statutory federal income tax rate as follows:

	Year Ended December 31,
	2017		2016		2015
Tax at federal statutory rate	35.0	%	35.0	%	35.0	%
State, net of federal benefit	1.1	%	1.8	%	2.6	%
Impact of international operations	(6.4	)%	(2.7	)%	7.1	%
Stock-based compensation	(0.9	)%	1.2	%	(0.4	)%
Tax credits	(1.6	)%	(0.9	)%	(1.2	)%
Impact of the Tax Act	53.3	%	—	%	—	%
Others	(1.9	)%	(0.3	)%	0.1	%
Provision for income taxes	78.6	%	34.1	%	43.2	%

Schedule of Reconciliation of Unrecognized Tax Benefits [Table Text Block]

A reconciliation of the beginning and ending amount of gross unrecognized tax benefits (“UTB”) is as follows:

	Federal, State, and Foreign Tax
	(In thousands)
Balance as of December 31, 2014	$	13,364
Additions based on tax positions related to the current year	1,608
Additions for tax positions of prior years	228
Settlements	(199		)
Reductions for tax positions of prior years	(302		)
Reductions due to lapse of applicable statutes	(1,053		)
Adjustments due to foreign exchange rate movement	(816		)
Balance as of December 31, 2015	12,830
Additions based on tax positions related to the current year	1,523
Additions for tax positions of prior years	45
Reductions for tax positions of prior years	(237		)
Reductions due to lapse of applicable statutes	(627		)
Adjustments due to foreign exchange rate movement	(569		)
Balance as of December 31, 2016	$	12,965
Additions based on tax positions related to the current year	938
Additions for tax positions of prior years	32
Reductions for tax positions of prior years	(1,477		)
Reductions due to lapse of applicable statutes	(899		)
Adjustments due to foreign exchange rate movement	1,008
Balance as of December 31, 2017	$	12,567