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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Before Income Taxes | The components of income before income taxes consisted of the following (in thousands):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Domestic | $ | 312,870 |  |  | $ | 260,564 |  |  | $ | 187,535 |
Foreign jurisdictions | 22,812 |  |  | 22,296 |  |  | 14,317 |
Income before income taxes | $ | 335,682 |  |  | $ | 282,860 |  |  | $ | 201,852 |
Schedule of Income Tax Provision | Income tax provision consisted of the following (in thousands):
| Current |  | Deferred |  | Total
Year ended December 31, 2023 |  |  |  |  |
U.S. Federal | $ | 64,381 |  |  | $ | (24,117) |  |  | $ | 40,264 |
U.S. state and local | 8,848 |  |  | (1,869) |  |  | 6,979 |
Foreign jurisdictions | 4,622 |  |  | 1,007 |  |  | 5,629 |
| $ | 77,851 |  |  | $ | (24,979) |  |  | $ | 52,872 |
Year ended December 31, 2022 |  |  |  |  |
U.S. Federal | $ | 49,991 |  |  | $ | (19,705) |  |  | $ | 30,286 |
U.S. state and local | 7,160 |  |  | (3,297) |  |  | 3,863 |
Foreign jurisdictions | 3,330 |  |  | 13 |  |  | 3,343 |
| $ | 60,481 |  |  | $ | (22,989) |  |  | $ | 37,492 |
Year ended December 31, 2021 |  |  |  |  |
U.S. Federal | $ | 46,138 |  |  | $ | (32,677) |  |  | $ | 13,461 |
U.S. state and local | 8,405 |  |  | (3,622) |  |  | 4,783 |
Foreign jurisdictions | 2,580 |  |  | (820) |  |  | 1,760 |
| $ | 57,123 |  |  | $ | (37,119) |  |  | $ | 20,004 |
Summary Of Difference Between Statutory Rate for Federal Income Tax and Effective Income Tax Rate | The difference between the statutory rate for federal income tax and the effective income tax rate was as follows (in thousands):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Income tax expense calculated at the federal statutory rate | $ | 70,493 |  |  | 21.0 | % |  | $ | 59,401 |  |  | 21.0 | % |  | $ | 42,389 |  |  | 21.0 | %
Effect of: |  |  |  |  |  |  |  |  |  |  |
State and local taxes, net of federal benefit | 5,146 |  |  | 1.5 |  |  | 4,235 |  |  | 1.5 |  |  | 3,698 |  |  | 1.8 |
Tax on foreign earnings, net of tax credits and deductions | (1,305) |  |  | (0.4) |  |  | (3,277) |  |  | (1.2) |  |  | (3,113) |  |  | (1.5) |
Deferred credit | (596) |  |  | (0.2) |  |  | (621) |  |  | (0.2) |  |  | (667) |  |  | (0.3) |
Permanent items: |  |  |  |  |  |  |  |  |  |  |
Stock-based awards | (14,692) |  |  | (4.4) |  |  | (18,738) |  |  | (6.6) |  |  | (19,042) |  |  | (9.5) |
Deduction for FDII | (9,358) |  |  | (2.8) |  |  | (4,983) |  |  | (1.8) |  |  | (4,860) |  |  | (2.4) |
Other | 63 |  |  | — |  |  | 595 |  |  | 0.2 |  |  | (364) |  |  | (0.2) |
State/Local tax credits | (2,536) |  |  | (0.8) |  |  | (1,294) |  |  | (0.5) |  |  | (976) |  |  | (0.5) |
Change in liability for uncertain tax positions | 4,784 |  |  | 1.4 |  |  | 1,560 |  |  | 0.6 |  |  | 2,349 |  |  | 1.2 |
Other | 873 |  |  | 0.5 |  |  | 614 |  |  | 0.3 |  |  | 590 |  |  | 0.3 |
| $ | 52,872 |  |  | 15.8 | % |  | $ | 37,492 |  |  | 13.3 | % |  | $ | 20,004 |  |  | 9.9 | %
Schedule of Components of Company's Net Deferred Tax Asset (Liability) | Components of the Company’s net deferred tax asset (liability) included in the consolidated balance sheets consisted of the following at December 31 (in thousands):
| 2023 |  | 2022
Deferred tax assets: |  |  |
Accrued liabilities | $ | 27,101 |  |  | $ | 24,483 |
Depreciation and amortization | 1,258 |  |  | 1,269 |
Foreign operating loss carryforward | 35 |  |  | 30 |
Advanced billings | 98,438 |  |  | 67,789 |
Other | 2,474 |  |  | 1,005 |
Valuation allowance | (1,826) |  |  | (430) |
Total deferred tax assets | 127,480 |  |  | 94,146 |
Deferred tax liabilities: |  |  |
Depreciation and amortization | (52,443) |  |  | (44,731) |
Prepaid expenses | (1,581) |  |  | (1,263) |
Other | (1,425) |  |  | (1,139) |
Total deferred tax liabilities | (55,449) |  |  | (47,133) |
Net deferred tax asset (liability) | $ | 72,031 |  |  | $ | 47,013 |
Schedule of Annual Activity Related to Valuation Allowance | Annual activity related to the Company’s valuation allowance is as follows (in thousands):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Beginning Balance | $ | 430 |  |  | $ | 850 |  |  | $ | 578 |
Additions charged to expense | 1,582 |  |  | 15 |  |  | 305 |
Reductions from utilization, reassessments and expirations | (186) |  |  | (493) |  |  | (33) |
Remeasurement due to effect of tax reform | — |  |  | 58 |  |  | — |
Ending Balance | $ | 1,826 |  |  | $ | 430 |  |  | $ | 850 |
Schedule of Gross Unrecognized Tax Benefits | A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows (in thousands):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Beginning Balance | $ | 15,947 |  |  | $ | 13,784 |  |  | $ | 10,691 |
Increases in tax positions for prior years | — |  |  | 171 |  |  | 1,253 |
Decreases in tax positions for prior years | (97) |  |  | (490) |  |  | (223) |
Increases in tax positions for current year | 5,382 |  |  | 4,871 |  |  | 3,098 |
Lapse in statute of limitations | (852) |  |  | (2,389) |  |  | (1,035) |
Ending Balance | $ | 20,380 |  |  | $ | 15,947 |  |  | $ | 13,784 |

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