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Income Taxes (Tables) | 12 Months Ended
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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 |

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