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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

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,						2023						2022						2021
Current
Federal						$	133,465					$	126,780					$	120,939
State						23,621						27,267						24,492
Foreign						8,807						26,255						9,480
						165,893						180,302						154,911
Deferred
Federal						(29,837)						(40,619)						(7,106)
State						(3,620)						(4,949)						(735)
Foreign						(39)						(921)						10
						(33,496)						(46,489)						(7,831)
Total income taxes						$	132,397					$	133,813					$	147,080

Schedule of Components of Net Income Before Income Taxes

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

Year Ended December 31,						2023						2022						2021
Domestic						$	545,642					$	474,894					$	641,403
Foreign						49,013						134,386						52,270
						$	594,655					$	609,280					$	693,673

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,			2023						2022						2021
Statutory rate			21.0		%				21.0		%				21.0		%
State taxes, net of federal tax benefit			2.6						2.9						2.6
Foreign tax expense and tax rate differential			(0.3)						(0.2)						(0.1)
Tax benefit from stock option exercises			(0.3)						(0.7)						(1.2)
Research and development tax credit			(1.1)						(1.1)						(1.0)
Foreign-Derived Intangible Income Deduction (FDII)			(0.3)						(0.3)						(0.2)
Other, net			0.7						0.4						0.1
			22.3		%				22.0		%				21.2		%

Schedule of Deferred Tax Assets and Liabilities

Significant components of deferred tax assets and liabilities at December 31, 2023 and 2022 are as follows:

						2023						2022
Deferred Tax Assets:
Stock-based compensation expense						$	35,999					$	35,865
Federal net operating loss and R&D Credit carryforward						5,477						6,565
State net operating loss carryforward						39,820						40,249
Foreign net operating loss carryforward and other						7,486						7,339
Capitalized research and development						11,759						—
Accrued expense associated with voluntary separation program						3,796						9,792
Basis differences in investments						5,111						2,432
Federal benefit of state tax deduction for uncertain tax positions						2,039						1,891
Revenue and expense recognized in different periods for financial reporting and income tax purposes						2,306						2,827
Other assets						2,509						4,021
Total deferred income tax assets						116,302						110,981
Less: Federal net operating loss and R&D valuation allowance						(794)						(794)
Less: State net operating loss valuation allowance						(36,966)						(36,963)
Less: Foreign net operating loss valuation allowance						(7,486)						(7,339)
Net deferred income tax assets						$	71,056					$	65,885
Deferred Tax Liabilities:
Capitalized research and development						$	—					$	(24,764)
Difference in financial reporting and income tax depreciation methods						(9,679)						(12,694)
Difference between book and tax basis of other assets						(7,652)						(7,265)
Goodwill and other intangibles						(6,784)						(7,482)
Capitalized contract costs						(9,232)						(8,744)
Total deferred income tax liabilities						$	(33,347)					$	(60,949)
Net deferred income tax assets						$	37,709					$	4,936

Schedule of Unrecognized Tax Benefits Roll Forward

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

						2023						2022						2021
Balance as of January 1						$	15,204					$	14,886					$	15,911
Tax positions related to current year:
Gross additions						3,395						3,481						3,672
Tax positions related to prior years:
Gross additions						120						251						382
Settlements						—						—						(678)
Lapses on statute of limitations						(3,187)						(3,414)						(4,401)
Balance as of December 31						$	15,532					$	15,204					$	14,886

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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