Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Schedule of Federal and State and Foreign Income Tax Provision

The federal and state and foreign income tax provision is summarized as follows: 

Year Ended December 31,	2024		2023		2022
Current
Federal	$	138,970	$	133,465	$	126,780
State	26,536		23,621		27,267
Foreign	13,840		8,807		26,255
	179,346		165,893		180,302
Deferred
Federal	(8,558)		(29,837)		(40,619)
State	(5,161)		(3,620)		(4,949)
Foreign	(61)		(39)		(921)
	(13,780)		(33,496)		(46,489)
Total income taxes	$	165,566	$	132,397	$	133,813

Schedule of Components of Net Income Before Income Taxes

The components of Income before income taxes are summarized as follows:

Year Ended December 31,	2024		2023		2022
Domestic	$	682,017	$	545,642	$	474,894
Foreign	64,740		49,013		134,386
	$	746,757	$	594,655	$	609,280

Schedule of Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate

The effective income tax rate differs from the federal income tax statutory rate due to the following:

Year Ended December 31,	2024		2023		2022
Statutory rate	21.0	%	21.0	%	21.0	%
State taxes, net of federal tax benefit	2.1		2.6		2.9
Foreign tax expense and tax rate differential	0.2		(0.3)		(0.2)
Tax benefit from stock option exercises	(0.7)		(0.3)		(0.7)
Research and development tax credit	(0.9)		(1.1)		(1.1)
Foreign-Derived Intangible Income Deduction (FDII)	(0.2)		(0.3)		(0.3)
Other, net	0.7		0.7		0.4
	22.2	%	22.3	%	22.0	%

Schedule of Deferred Tax Assets and Liabilities

Significant components of deferred tax assets and liabilities at December 31, 2024 and 2023 are as follows:

	2024		2023
Deferred Tax Assets:
Stock-based compensation expense	$	41,176	$	35,999
Federal net operating loss and R&D credit carryforward	4,388		5,477
State net operating loss carryforward	37,339		39,820
Foreign net operating loss carryforward and other	6,905		7,486
Capitalized research and development	18,650		11,759
Accrued expense associated with voluntary separation program	389		3,796
Basis differences in investments	7,079		5,111
Federal benefit of state tax deduction for uncertain tax positions	2,079		2,039
Revenue and expense recognized in different periods for financial reporting and income tax purposes	2,402		2,306
Other assets	2,419		2,509
Total deferred income tax assets	122,826		116,302
Less: Federal net operating loss and R&D valuation allowance	(794)		(794)
Less: State net operating loss valuation allowance	(32,057)		(36,966)
Less: Foreign net operating loss valuation allowance	(6,905)		(7,486)
Net deferred income tax assets	$	83,070	$	71,056
Deferred Tax Liabilities:
Difference in financial reporting and income tax depreciation methods	$	(6,237)	$	(9,679)
Difference between book and tax basis of other assets	(8,316)		(7,652)
Goodwill and other intangibles	(6,263)		(6,784)
Capitalized contract costs	(10,270)		(9,232)
Total deferred income tax liabilities	$	(31,086)	$	(33,347)
Net deferred income tax assets	$	51,984	$	37,709

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:

	2024		2023		2022
Balance as of January 1	$	15,532	$	15,204	$	14,886
Tax positions related to current year:
Gross additions	3,460		3,395		3,481
Tax positions related to prior years:
Gross additions	106		120		251
Settlements	(491)		—		—
Lapses on statute of limitations	(3,366)		(3,187)		(3,414)
Balance as of December 31	$	15,241	$	15,532	$	15,204