Fair Value - Principal Amounts and Fair Values of Borrowings (Details)
€ in Thousands, £ in Thousands, $ in Thousands |
Mar. 31, 2023
USD ($)
|
Mar. 31, 2023
GBP (£)
|
Mar. 31, 2023
EUR (€)
|
Dec. 31, 2022
USD ($)
|
Dec. 31, 2022
GBP (£)
|
Dec. 31, 2022
EUR (€)
|
| Principal Amount |
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
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| Borrowings |
$ 2,010,448
|
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$ 1,997,823
|
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| Principal Amount | Unsecured Notes |
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|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
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| Borrowings |
441,500
|
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|
531,500
|
|
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| Principal Amount | SBA-guaranteed debentures |
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|
|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
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| Borrowings |
300,000
|
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300,000
|
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| Principal Amount | Convertible Notes |
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
376,816
|
|
|
316,816
|
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| Principal Amount | Revolving Credit Facility | Holdings Credit Facility | Credit Facility |
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|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
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| Borrowings |
614,663
|
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|
618,963
|
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| Principal Amount | Revolving Credit Facility | DB Credit Facility | Credit Facility |
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|
|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
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| Borrowings |
186,400
|
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|
186,400
|
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| Principal Amount | Revolving Credit Facility | NMFC Credit Facility | Credit Facility |
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|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
87,949
|
£ 22,850
|
€ 700
|
40,359
|
£ 22,850
|
€ 700
|
| Principal Amount | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility |
|
|
|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
3,120
|
|
|
3,785
|
|
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| Fair Value |
|
|
|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
1,934,587
|
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|
1,899,243
|
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| Fair Value | Unsecured Notes |
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|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
415,130
|
|
|
499,551
|
|
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| Fair Value | SBA-guaranteed debentures |
|
|
|
|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
264,070
|
|
|
250,442
|
|
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| Fair Value | Convertible Notes |
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|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
379,911
|
|
|
317,071
|
|
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| Fair Value | Revolving Credit Facility | Holdings Credit Facility | Credit Facility |
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
601,760
|
|
|
604,971
|
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| Fair Value | Revolving Credit Facility | DB Credit Facility | Credit Facility |
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
183,970
|
|
|
183,734
|
|
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| Fair Value | Revolving Credit Facility | NMFC Credit Facility | Credit Facility |
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|
|
|
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
|
|
|
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| Borrowings |
86,618
|
£ 22,504
|
€ 689
|
39,699
|
£ 22,476
|
€ 689
|
| Fair Value | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility |
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| Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |
|
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|
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| Borrowings |
$ 3,128
|
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|
$ 3,775
|
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