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Fair Value - Principal Amounts and Fair Values of Borrowings (Details) € in Thousands, £ in Thousands, $ in Thousands	Jun. 30, 2025 USD ($)	Jun. 30, 2025 EUR (€)	Jun. 30, 2025 GBP (£)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 GBP (£)
Principal Amount
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	$ 1,788,712			$ 1,872,307
Principal Amount | Unsecured Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	990,000			990,000
Principal Amount | SBA-guaranteed debentures
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	262,500			300,000
Principal Amount | 2022 Convertible Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	258,777			260,000
Principal Amount | Credit Facility | Holdings Credit Facility | Revolving Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	246,063			294,363
Principal Amount | Credit Facility | NMFC Credit Facility | Revolving Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	31,372	€ 16,512	£ 8,666	27,944	€ 16,512	£ 8,666
Fair Value
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	1,770,850			1,849,230
Fair Value | Unsecured Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	998,112			991,624
Fair Value | SBA-guaranteed debentures
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	236,815			270,548
Fair Value | 2022 Convertible Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	259,825			261,811
Fair Value | Credit Facility | Holdings Credit Facility | Revolving Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	244,919			298,435
Fair Value | Credit Facility | NMFC Credit Facility | Revolving Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	$ 31,179	€ 16,409	£ 8,614	$ 26,812	€ 15,379	£ 8,700

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