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Segment Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting [Abstract] |  |  |
Number of reportable segments | segment | 1 |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | $ 3,795,115 | $ 3,268,940 | $ 2,840,124
Total operating expenses | 3,118,660 | 2,748,684 | 2,463,910
Operating income | 676,455 | 520,256 | 376,214
Total investment income | 69,260 | 28,968 | 632
Interest expense, net | 0 | 0 | 2,009
Other income | 11,564 | 12,712 | 1,615
Income tax expense | 156,965 | 115,875 | 77,883
Net income | 600,314 | 446,061 | 298,569
Management fee revenue - administrative services |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | 68,355 | 63,669 | 58,323
Administrative services reimbursement revenue |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | 806,336 | 737,139 | 668,268
Total operating expenses | 806,336 | 737,139 | 668,268
Service agreement revenue |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | 26,350 | 26,059 | 25,687
Management fee revenue - policy issuance and renewal services |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | 2,894,074 | 2,442,073 | 2,087,846
Total operating expenses | 2,312,324 | 2,011,545 | 1,795,642
Management Operations |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | 3,795,115 | 3,268,940 | 2,840,124
Commissions | 1,601,401 | 1,348,530 | 1,179,569
Underwriting and policy processing | 199,485 | 181,003 | 171,625
Information technology | 215,488 | 216,746 | 198,157
Sales and advertising | 66,480 | 58,905 | 60,000
Customer service | 43,045 | 34,391 | 34,333
Administrative and other | 186,425 | 171,970 | 151,958
Total operating expenses | 3,118,660 | 2,748,684 | 2,463,910
Operating income | 676,455 | 520,256 | 376,214
Total investment income | 69,260 | 28,968 | 632
Interest expense, net | 0 | 0 | 2,009
Other income | 11,564 | 12,712 | 1,615
Income tax expense | 156,965 | 115,875 | 77,883
Net income | 600,314 | 446,061 | 298,569
Management Operations | Administrative services reimbursement revenue |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | 806,336 | 737,139 | 668,268
Total operating expenses | 806,336 | 737,139 | 668,268
Management Operations | Service agreement revenue |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | 26,350 | 26,059 | 25,687
Management Operations | Management fee revenue - policy issuance and renewal services |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating expenses | 2,312,324 | 2,011,545 | 1,795,642
Management Operations | Management fee revenue |  |  |
Schedule of Segment Reporting Information, by Segment [Table] |  |  |
Total operating revenue | $ 2,962,429 | $ 2,505,742 | $ 2,146,169

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