Intangible Assets - Schedule of Cost and Accumulated Amortization (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 213,512	$ 209,296
Accumulated amortization	(124,387)	(120,381)
​Total	89,125	88,915
State licenses
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	11,263	11,263
Accumulated amortization	0	0
​Total	11,263	11,263
Internally developed software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	160,345	155,933
Accumulated amortization	(105,461)	(102,326)
​Total	$ 54,884	$ 53,607
Internally developed software | Weighted average useful life
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	3 years 4 months 24 days	3 years 4 months 24 days
Renewal rights
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 21,551	$ 21,740
Accumulated amortization	(11,148)	(10,693)
​Total	$ 10,403	$ 11,047
Renewal rights | Weighted average useful life
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	10 years	10 years
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 11,867	$ 11,867
Accumulated amortization	(4,690)	(4,402)
​Total	$ 7,177	$ 7,465
Trade names and trademarks | Weighted average useful life
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	14 years 2 months 12 days	14 years 2 months 12 days
Relationships and customer lists
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 7,907	$ 7,913
Accumulated amortization	(2,509)	(2,380)
​Total	$ 5,398	$ 5,533
Relationships and customer lists | Weighted average useful life
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	15 years 6 months	15 years 6 months
Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 579	$ 580
Accumulated amortization	(579)	(580)
​Total	$ 0	$ 0
Other | Weighted average useful life
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	3 years 6 months	3 years 6 months