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Fair Value - Principal Amounts and Fair Values of Borrowings (Details) € in Thousands, £ in Thousands, $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 GBP (£)
Principal Amount
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	$ 1,872,307			$ 1,807,629
Principal Amount | Unsecured Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	990,000			506,500
Principal Amount | SBA-guaranteed debentures
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	300,000			300,000
Principal Amount | Credit Facility | Revolving Credit Facility | Holdings Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	294,363			515,063
Principal Amount | Credit Facility | Revolving Credit Facility | NMFC Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	27,944	€ 16,512	£ 8,666	36,813	€ 700	£ 22,850
Principal Amount | Credit Facility | Revolving Credit Facility | DB Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	0			186,400
Principal Amount | Credit Facility | Revolving Credit Facility | NMNLC Credit Facility II
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	0			2,853
Principal Amount | Convertible Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	260,000			260,000
Fair Value
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	1,849,230			1,750,087
Fair Value | Unsecured Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	991,624			490,200
Fair Value | SBA-guaranteed debentures
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	270,548			259,811
Fair Value | Credit Facility | Revolving Credit Facility | Holdings Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	298,435			511,511
Fair Value | Credit Facility | Revolving Credit Facility | NMFC Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	26,812	€ 15,379	£ 8,700	36,507	€ 694	£ 22,660
Fair Value | Credit Facility | Revolving Credit Facility | DB Credit Facility
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	0			184,506
Fair Value | Credit Facility | Revolving Credit Facility | NMNLC Credit Facility II
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	0			2,846
Fair Value | Convertible Notes
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Borrowings	$ 261,811			$ 264,706

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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