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Fair Value - Principal Amounts and Fair Values of Borrowings (Details) € in Thousands, £ in Thousands, $ in Thousands | Jun. 30, 2023 USD ($) | Jun. 30, 2023 GBP (£) | Jun. 30, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€)
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Principal Amount |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | $ 1,923,195 |  |  | $ 1,997,823 |  |
Principal Amount | Unsecured Notes |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 391,500 |  |  | 531,500 |  |
Principal Amount | Convertible Notes |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 376,816 |  |  | 316,816 |  |
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 | Revolving Credit Facility | Holdings Credit Facility | Credit Facility |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 574,263 |  |  | 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 |  |  | 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 | 91,290 | £ 22,850 | € 700 | 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 | 2,926 |  |  | 3,785 |  |
Fair Value |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 1,838,619 |  |  | 1,899,243 |  |
Fair Value | Unsecured Notes |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 362,755 |  |  | 499,551 |  |
Fair Value | Convertible Notes |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 380,285 |  |  | 317,071 |  |
Fair Value | SBA-guaranteed debentures |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 252,139 |  |  | 250,442 |  |
Fair Value | Revolving Credit Facility | Holdings Credit Facility | Credit Facility |  |  |  |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |  |  |  |
Borrowings | 564,600 |  |  | 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 | 185,433 |  |  | 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 | 90,494 | £ 22,651 | € 694 | 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 | $ 2,913 |  |  | $ 3,775 |  |

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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 + Details
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