Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Components Of Income Before Income Taxes

Income before income taxes included the following components:

	Year Ended December 31,
(in thousands)	2020		2019		2018
Domestic	$	465,382	$	448,271	$	455,478
Foreign	28,543		74,312		31,607
Total	$	493,925	$	522,583	$	487,085

Components Of Provision For Income Taxes

The provision for income taxes was composed of the following:

	Year Ended December 31,
(in thousands)	2020		2019		2018
Current:
Federal	$	26,855	$	44,824	$	58,138
State	12,738		9,554		12,888
Foreign	51,377		31,421		30,359
Deferred:
Federal	(12,203)		(8,833)		(20,764)
State	(2,119)		(965)		(2,901)
Foreign	(16,610)		(4,713)		(10,010)
Total	$	60,038	$	71,288	$	67,710

Reconciliation Of U.S. Federal Statutory Tax Rate To Consolidated Effective Tax Rate

The reconciliation of the U.S. federal statutory tax rate to the consolidated effective tax rate was as follows:

	Year Ended December 31,
	2020		2019		2018
Federal statutory tax rate	21.0	%	21.0	%	21.0	%
State income taxes, net of federal benefit	1.6		1.5		1.5
Foreign rate differential	0.4		0.8		0.8
Uncertain tax positions	0.1		(0.2)		0.5
Valuation allowance release	(0.8)		(1.3)		—
Benefit from entity structuring activities	(1.5)		—		(1.4)
Foreign-derived intangible income deduction	(2.8)		(3.8)		(3.9)
Research and development credits	(3.2)		(2.2)		(2.3)
Stock-based compensation	(3.6)		(3.1)		(3.3)
Other	1.0		0.9		1.0
	12.2	%	13.6	%	13.9	%

Components Of Deferred Tax Assets And Liabilities

The components of deferred tax assets and liabilities are as follows:

	December 31,
(in thousands)	2020		2019
Deferred tax assets:
Net operating loss carryforwards	$	47,551	$	35,044
Operating lease liabilities	34,803		26,628
Stock-based compensation	24,738		24,254
Uncertain tax positions	18,565		19,227
Employee benefits	13,290		9,392
Research and development credits	9,847		5,865
Allowance for doubtful accounts	3,193		1,841
Other	6,856		4,468
Valuation allowance	(15,398)		(17,524)
Total deferred tax assets	143,445		109,195
Deferred tax liabilities:
Other intangible assets	(147,960)		(99,193)
Operating lease right-of-use assets	(33,304)		(25,648)
Deferred revenue	(26,839)		(13,744)
Accounting method change	(10,781)		(21,396)
Property and equipment	(6,052)		(3,780)
Total deferred tax liabilities	(224,936)		(163,761)
Net deferred tax liabilities	$	(81,491)	$	(54,566)

Reconciliation Of Unrecognized Tax Benefits

The following is a reconciliation of the total amounts of unrecognized tax benefits:

	Year Ended December 31,
(in thousands)	2020		2019		2018
Unrecognized tax benefit as of January 1	$	49,085	$	22,827	$	19,657
Gross changes—acquisitions	(24,963)		26,914		—
Gross increases—tax positions in prior period	1,572		207		1,229
Gross decreases—tax positions in prior period	—		(1,743)		(376)
Gross increases—tax positions in current period	1,281		3,563		4,014
Reductions due to a lapse of the applicable statute of limitations	(3,502)		(2,230)		(994)
Changes due to currency fluctuation	994		(453)		(703)
Settlements	(392)		—		—
Unrecognized tax benefit as of December 31	$	24,075	$	49,085	$	22,827