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Segment Disclosures - Summary of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Revenue | $ 494,297 | $ 454,606
Operating expenses (income) | 376,485 | 341,011
Gross margin | 117,812 | 113,595
Corporate general and administrative expenses | 18,711 | 15,598
Operating income | 99,101 | 97,997
Other income (expense): |  |
Interest expense | (4,511) | (3,641)
Gain on sale of operations, net | 0 | 99
Other income (expense), net | 9,424 | 5,112
Total other income, net | 4,913 | 1,570
Income before income tax expense | 104,014 | 99,567
Financial Services |  |
Segment Reporting Information [Line Items] |  |
Revenue | 372,630 | 343,086
Benefits and Insurance Services |  |
Segment Reporting Information [Line Items] |  |
Revenue | 108,408 | 100,054
National Practices |  |
Segment Reporting Information [Line Items] |  |
Revenue | 13,259 | 11,466
Operating Segments | Financial Services |  |
Segment Reporting Information [Line Items] |  |
Revenue | 372,630 | 343,086
Operating expenses (income) | 265,561 | 244,443
Gross margin | 107,069 | 98,643
Corporate general and administrative expenses | 0 | 0
Operating income | 107,069 | 98,643
Other income (expense): |  |
Interest expense | 0 | 0
Gain on sale of operations, net |  | 99
Other income (expense), net | 86 | 255
Total other income, net | 86 | 354
Income before income tax expense | 107,155 | 98,997
Operating Segments | Benefits and Insurance Services |  |
Segment Reporting Information [Line Items] |  |
Revenue | 108,408 | 100,054
Operating expenses (income) | 83,637 | 76,923
Gross margin | 24,771 | 23,131
Corporate general and administrative expenses | 0 | 0
Operating income | 24,771 | 23,131
Other income (expense): |  |
Interest expense | 0 | (1)
Gain on sale of operations, net |  | 0
Other income (expense), net | 44 | 177
Total other income, net | 44 | 176
Income before income tax expense | 24,815 | 23,307
Operating Segments | National Practices |  |
Segment Reporting Information [Line Items] |  |
Revenue | 13,259 | 11,466
Operating expenses (income) | 11,933 | 10,583
Gross margin | 1,326 | 883
Corporate general and administrative expenses | 0 | 0
Operating income | 1,326 | 883
Other income (expense): |  |
Interest expense | 0 | 0
Gain on sale of operations, net |  | 0
Other income (expense), net | 0 | 0
Total other income, net | 0 | 0
Income before income tax expense | 1,326 | 883
Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
Revenue | 0 | 0
Operating expenses (income) | 15,354 | 9,062
Gross margin | (15,354) | (9,062)
Corporate general and administrative expenses | 18,711 | 15,598
Operating income | (34,065) | (24,660)
Other income (expense): |  |
Interest expense | (4,511) | (3,640)
Gain on sale of operations, net |  | 0
Other income (expense), net | 9,294 | 4,680
Total other income, net | 4,783 | 1,040
Income before income tax expense | $ (29,282) | $ (23,620)

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