Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Components Of Income Before Income Taxes

Income before income taxes included the following components:

	Year Ended December 31,
(in thousands)	2019		2018		2017
Domestic	$	448,271	$	455,478	$	344,447
Foreign	74,312		31,607		51,247
Total	$	522,583	$	487,085	$	395,694

Components Of Provision For Income Taxes

The provision for income taxes was composed of the following:

	Year Ended December 31,
(in thousands)	2019			2018			2017
Current:
Federal	$	44,824		$	58,138		$	112,414
State	9,554			12,888			7,879
Foreign	31,421			30,359			18,843
Deferred:
Federal	(8,833		)	(20,764		)	(7,387		)
State	(965		)	(2,901		)	(584		)
Foreign	(4,713		)	(10,010		)	5,278
Total	$	71,288		$	67,710		$	136,443

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,
	2019		2018		2017
Federal statutory tax rate	21.0	%	21.0	%	35.0	%
State income taxes, net of federal benefit	1.5		1.5		1.1
Foreign rate differential	0.8		0.8		0.1
Uncertain tax positions	(0.2	)	0.5		0.3
U.S. tax reform enactment	(0.4	)	0.2		4.5
Valuation allowance release	(1.3	)	—		—
Domestic production activity benefit	—		—		(2.6	)
Benefit from entity structuring activities	—		(1.4	)	—
Research and development credits	(2.2	)	(2.3	)	(1.4	)
Stock-based compensation	(3.1	)	(3.3	)	(3.1	)
Foreign-derived intangible income deduction	(3.8	)	(3.9	)	—
Other	1.3		0.8		0.6
	13.6	%	13.9	%	34.5	%

Components Of Deferred Tax Assets And Liabilities

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

	December 31,
(in thousands)	2019			2018
Deferred tax assets:
Net operating loss carryforwards	$	35,044		$	39,290
Operating lease liabilities	26,628			—
Stock-based compensation	24,254			20,464
Uncertain tax positions	19,227			17,823
Employee benefits	9,392			15,048
Research and development credits	5,865			5,951
Other	6,309			4,121
Valuation allowance	(17,524		)	(21,676		)
Total deferred tax assets	109,195			81,021
Deferred tax liabilities:
Other intangible assets	(99,193		)	(38,787		)
Operating lease right-of-use assets	(25,648		)	—
Accounting method change	(21,396		)	(31,626		)
Deferred revenue	(13,744		)	(12,021		)
Property and equipment	(3,780		)	(2,034		)
Total deferred tax liabilities	(163,761		)	(84,468		)
Net deferred tax liabilities	$	(54,566	)	$	(3,447	)

Reconciliation Of Unrecognized Tax Benefits

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

	Year Ended December 31,
(in thousands)	2019			2018			2017
Unrecognized tax benefit as of January 1	$	22,827		$	19,657		$	15,209
Gross increases—acquisitions	26,914			—			—
Gross increases—tax positions in prior period	207			1,229			905
Gross decreases—tax positions in prior period	(1,743		)	(376		)	(765		)
Gross increases—tax positions in current period	3,563			4,014			3,757
Reductions due to a lapse of the applicable statute of limitations	(2,230		)	(994		)	(847		)
Changes due to currency fluctuation	(453		)	(703		)	1,414
Settlements	—			—			(16		)
Unrecognized tax benefit as of December 31	$	49,085		$	22,827		$	19,657