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Fair Value - Carrying and Fair Values of Borrowings (Details) - Dec. 31, 2022 € in Thousands, £ in Thousands, $ in Thousands | USD ($) | GBP (£) | EUR (€)
--- | --- | --- | ---
Principal Amount |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | $ 1,997,823 |  |
Principal Amount | Unsecured Notes |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 531,500 |  |
Principal Amount | SBA-guaranteed debentures |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 300,000 |  |
Principal Amount | Convertible Notes |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 316,816 |  |
Principal Amount | Revolving Credit Facility | Holdings Credit Facility | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 618,963 |  |
Principal Amount | Revolving Credit Facility | DB Credit Facility | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 186,400 |  |
Principal Amount | Revolving Credit Facility | NMFC Credit Facility | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 40,359 | £ 22,850 | € 700
Principal Amount | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 3,785 |  |
Fair Value |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 1,899,243 |  |
Fair Value | Unsecured Notes |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 499,551 |  |
Fair Value | SBA-guaranteed debentures |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 250,442 |  |
Fair Value | Convertible Notes |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 317,071 |  |
Fair Value | Revolving Credit Facility | Holdings Credit Facility | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 604,971 |  |
Fair Value | Revolving Credit Facility | DB Credit Facility | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 183,734 |  |
Fair Value | Revolving Credit Facility | NMFC Credit Facility | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | 39,699 | £ 22,476 | € 689
Fair Value | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Borrowings | $ 3,775 |  |

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