Fair Value of Financial Instruments - Assets at Fair Value on a Recurring Basis (Details) - Fair Value - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	$ 591,045	$ 643,432
Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	43,925	46,436
Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	69,030	78,298
Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	478,090	518,698
Bond
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	57	62
Bond | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Bond | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	57	62
Bond | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Common stock
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	170,397	204,264
Common stock | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	43,925	46,436
Common stock | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Common stock | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	126,472	157,828
Convertible notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	14,081	20,846
Convertible notes | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Convertible notes | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Convertible notes | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	14,081	20,846
LLC interest
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	51,473	36,777
LLC interest | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
LLC interest | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
LLC interest | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	51,473	36,777
LP interest
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	234,543	266,055
LP interest | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
LP interest | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	67,145	76,396
LP interest | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	167,398	189,659
Preferred Shares
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	72,719	69,895
Preferred Shares | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Preferred Shares | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Preferred Shares | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	72,719	69,895
Rights and warrants
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	1,788	1,788
Rights and warrants | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Rights and warrants | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	1,788	1,788
Rights and warrants | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Senior loan
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	45,987	43,745
Senior loan | Level 1
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	0	0
Senior loan | Level 2
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	40	52
Senior loan | Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Investments, fair value disclosure	$ 45,947	$ 43,693