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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Earning Before Income Taxes and Related Income Tax Expenses | The following table presents the U.S. and foreign components of earnings before income taxes and the related income tax expense (in thousands):
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
Earnings before income taxes: |  |  |  |  |
United States | $ | 263,421 |  |  | $ | 274,415 |  |  | $ | 200,657 |
Foreign | 114,433 |  |  | 100,018 |  |  | 91,900 |
| $ | 377,854 |  |  | $ | 374,433 |  |  | $ | 292,557 |
Income tax expense: |  |  |  |  |
Current: |  |  |  |  |
U.S. Federal | $ | 62,575 |  |  | $ | 61,245 |  |  | $ | 29,478 |
U.S. State and local | 16,764 |  |  | 15,788 |  |  | 7,391 |
Foreign | 30,286 |  |  | 26,043 |  |  | 24,485 |
| 109,625 |  |  | 103,076 |  |  | 61,354 |
Deferred: |  |  |  |  |
U.S. Federal | (10,923) |  |  | (7,267) |  |  | 11,104 |
U.S. State and local | (3,324) |  |  | (1,153) |  |  | 3,239 |
Foreign | 1,167 |  |  | (831) |  |  | (2,485) |
| (13,080) |  |  | (9,251) |  |  | 11,858 |
| $ | 96,545 |  |  | $ | 93,825 |  |  | $ | 73,212 |
Schedule Reconciles Difference Between U.S. Federal Income Taxes at U.S. Statutory Rate and Our Income Tax Expense | The following schedule reconciles the differences between the U.S. federal income taxes at the U.S. statutory rate and our income tax expense (dollars in thousands):
| 2023 |  | 2022 |  | 2021
Statutory federal income tax rate | $ | 79,349 |  |  | 21.0 | % |  | $ | 78,631 |  |  | 21.0 | % |  | $ | 61,437 |  |  | 21.0 | %
State income tax expense, net of federal income tax benefit | 12,113 |  |  | 3.2 |  |  | 13,962 |  |  | 3.7 |  |  | 10,666 |  |  | 3.6 |
Audits and adjustments, net | (925) |  |  | (0.2) |  |  | 2,273 |  |  | 0.6 |  |  | 2,131 |  |  | 0.7 |
Change in valuation allowances | 1,616 |  |  | 0.4 |  |  | (2,551) |  |  | (0.7) |  |  | 1,317 |  |  | 0.5 |
Foreign income taxed at different rates | 6,133 |  |  | 1.6 |  |  | 5,660 |  |  | 1.5 |  |  | 4,308 |  |  | 1.5 |
Research and other credits | (3,036) |  |  | (0.8) |  |  | (3,870) |  |  | (1.0) |  |  | (4,352) |  |  | (1.5) |
Other, net | 1,295 |  |  | 0.4 |  |  | (280) |  |  | — |  |  | (2,295) |  |  | (0.8) |
Effective tax rate | $ | 96,545 |  |  | 25.6 | % |  | $ | 93,825 |  |  | 25.1 | % |  | $ | 73,212 |  |  | 25.0 | %
Significant Components of Deferred Tax Assets and Liabilities | The significant components of deferred tax assets and liabilities are as follows (in thousands):
| December 31,
| 2023 |  | 2022
Deferred tax assets: |  |  |
Capitalized research expenses | $ | 33,569 |  |  | $ | 17,682 |
Loss carryforwards | $ | 25,690 |  |  | $ | 24,571 |
Foreign tax credits | 9,976 |  |  | 10,681 |
Other | 31,246 |  |  | 37,315 |
Gross deferred tax assets | 100,481 |  |  | 90,249 |
Valuation allowances | (33,385) |  |  | (32,546) |
Total deferred tax assets | 67,096 |  |  | 57,703 |
Deferred tax liabilities: |  |  |
Goodwill and other intangibles | (58,512) |  |  | (56,275) |
Property and equipment | (31,194) |  |  | (26,905) |
Other | (1,916) |  |  | (1,744) |
Total deferred tax liabilities | (91,622) |  |  | (84,924) |
Net deferred tax liabilities | $ | (24,526) |  |  | $ | (27,221) |
Net Non-Current Deferred Tax Assets and Liabilities | The net non-current deferred tax assets and liabilities are as follows (in thousands):
| December 31,
| 2023 |  | 2022
Net non-current deferred tax assets, which are included in "Other assets" | $ | 3,062 |  |  | $ | 5,623 |
Net non-current deferred tax liabilities | (27,588) |  |  | (32,844) |
Net deferred tax liabilities | $ | (24,526) |  |  | $ | (27,221) |

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