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Business Segment Reporting - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 100,619	$ 91,141	$ 195,654	$ 180,592
Operating Segments
Segment Reporting Information [Line Items]
Revenue	100,619	91,141	195,654	180,592
Nonsegment
Segment Reporting Information [Line Items]
Investment partnership gains (losses)	0	0	0	0
Investment gains (losses)	0	0	0	0
Interest expenses not allocated to segments	0	0	0	0
Corporate and other
Segment Reporting Information [Line Items]
Corporate and other	$ 0	$ 0	$ 0	$ 0

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