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Income Taxes (Tables) | 12 Months Ended
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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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