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Segment Disclosures - Summary of Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 1,591,194 | $ 1,411,979 | $ 1,104,925
Operating expenses | 1,367,990 | 1,188,612 | 945,635
Gross margin | 223,204 | 223,367 | 159,290
Corporate general and administrative expenses | 57,965 | 55,023 | 56,150
Legal settlement, net | 0 | 0 | 30,468
Operating income | 165,239 | 168,344 | 72,672
Other income (expense): |  |  |
Interest expense | (20,131) | (8,039) | (3,868)
(Loss) gain on sale of operations, net | 176 | 413 | 5,995
Other income, net | 21,019 | (19,243) | 18,217
Total other income (expense), net | 1,064 | (26,869) | 20,344
Income before income tax expense | 166,303 | 141,475 | 93,016
Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 1,160,686 | 1,010,068 | 734,026
Benefits and Insurance Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 382,605 | 358,007 | 332,323
National Practices |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 47,903 | 43,904 | 38,576
Operating Segments | Financial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 1,160,686 | 1,010,068 | 734,026
Operating expenses | 975,076 | 850,038 | 608,238
Gross margin | 185,610 | 160,030 | 125,788
Corporate general and administrative expenses | 0 | 0 | 0
Legal settlement, net |  |  | 0
Operating income | 185,610 | 160,030 | 125,788
Other income (expense): |  |  |
Interest expense | 0 | 0 | 0
(Loss) gain on sale of operations, net | 176 | 413 | (289)
Other income, net | 2,042 | 269 | 263
Total other income (expense), net | 2,218 | 682 | (26)
Income before income tax expense | 187,828 | 160,712 | 125,762
Operating Segments | Benefits and Insurance Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 382,605 | 358,007 | 332,323
Operating expenses | 310,510 | 290,387 | 271,650
Gross margin | 72,095 | 67,620 | 60,673
Corporate general and administrative expenses | 0 | 0 | 0
Legal settlement, net |  |  | 0
Operating income | 72,095 | 67,620 | 60,673
Other income (expense): |  |  |
Interest expense | (2) | (6) | 0
(Loss) gain on sale of operations, net | 0 | 0 | 6,284
Other income, net | 2,060 | 2,392 | 827
Total other income (expense), net | 2,058 | 2,386 | 7,111
Income before income tax expense | 74,153 | 70,006 | 67,784
Operating Segments | National Practices |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 47,903 | 43,904 | 38,576
Operating expenses | 43,060 | 39,201 | 34,494
Gross margin | 4,843 | 4,703 | 4,082
Corporate general and administrative expenses | 0 | 0 | 0
Legal settlement, net |  |  | 0
Operating income | 4,843 | 4,703 | 4,082
Other income (expense): |  |  |
Interest expense | 0 | 0 | 0
(Loss) gain on sale of operations, net | 0 | 0 | 0
Other income, net | 1 | 10 | 3
Total other income (expense), net | 1 | 10 | 3
Income before income tax expense | 4,844 | 4,713 | 4,085
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 0 | 0 | 0
Operating expenses | 39,344 | 8,986 | 31,253
Gross margin | (39,344) | (8,986) | (31,253)
Corporate general and administrative expenses | 57,965 | 55,023 | 56,150
Legal settlement, net |  |  | 30,468
Operating income | (97,309) | (64,009) | (117,871)
Other income (expense): |  |  |
Interest expense | (20,129) | (8,033) | (3,868)
(Loss) gain on sale of operations, net | 0 | 0 | 0
Other income, net | 16,916 | (21,914) | 17,124
Total other income (expense), net | (3,213) | (29,947) | 13,256
Income before income tax expense | $ (100,522) | $ (93,956) | $ (104,615)

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