Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total income	$ 49,453	$ 51,285	$ 100,265	$ 109,332
Management/advisory fees
Disaggregation of Revenue [Line Items]
Total income	47,029	46,844	93,253	93,314
Incentive fees
Disaggregation of Revenue [Line Items]
Total income	53	469	216	1,046
Distributions from investments
Disaggregation of Revenue [Line Items]
Total income	2,240	2,203	6,410	12,233
Other fees/income
Disaggregation of Revenue [Line Items]
Total income	131	1,769	386	2,739
Operating Segments
Disaggregation of Revenue [Line Items]
Total income	49,453	51,285	100,265	109,332
Operating Segments | Management/advisory fees
Disaggregation of Revenue [Line Items]
Total income	47,029	46,844	93,253	93,314
Operating Segments | Incentive fees
Disaggregation of Revenue [Line Items]
Total income	53	469	216	1,046
Operating Segments | Distributions from investments
Disaggregation of Revenue [Line Items]
Total income	2,240	2,203	6,410	12,233
Operating Segments | Other fees/income
Disaggregation of Revenue [Line Items]
Total income	$ 131	$ 1,769	$ 386	$ 2,739