Financial Highlights (Details)
$ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands |
3 Months Ended |
6 Months Ended |
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Jun. 30, 2023
USD ($)
$ / shares
shares
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Jun. 30, 2022
USD ($)
$ / shares
shares
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Jun. 30, 2023
USD ($)
$ / shares
shares
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Jun. 30, 2022
USD ($)
$ / shares
shares
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Jun. 30, 2023
GBP (£)
shares
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Jun. 30, 2023
EUR (€)
shares
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Dec. 31, 2022
USD ($)
shares
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Dec. 31, 2022
GBP (£)
shares
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Dec. 31, 2022
EUR (€)
shares
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Jun. 30, 2022
GBP (£)
shares
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Jun. 30, 2022
EUR (€)
shares
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| Investment Company, Financial Highlights [Roll Forward] |
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| Net asset value, beginning balance (in dollars per share) | $ / shares |
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$ 13.02
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$ 13.49
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| Net investment income (in dollars per share) | $ / shares |
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0.77
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0.61
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| Net realized and unrealized (losses) gains (in dollars per share) | $ / shares |
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0.02
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(0.08)
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| Total net increase (in dollars per share) | $ / shares |
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0.79
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0.53
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| Distributions declared to stockholders from net investment income (in dollars per share) | $ / shares |
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(0.67)
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(0.60)
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| Net asset value, ending balance (in dollars per share) | $ / shares |
$ 13.14
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$ 13.42
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13.14
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13.42
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| Per share market value (in dollars per share) | $ / shares |
$ 12.44
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$ 11.91
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$ 12.44
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$ 11.91
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| Total return based on market value |
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6.04%
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(9.00%)
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| Total return based on net asset value |
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6.09%
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3.95%
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| Shares outstanding at end of period (in shares) | shares |
100,937,026
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100,937,026
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100,937,026
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100,937,026
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100,937,026
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100,937,026
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100,937,026
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100,716,928
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100,716,928
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| Average weighted shares outstanding for the period - basic (in shares) | shares |
100,937,026
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100,596,188
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100,937,026
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99,510,862
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| Average net assets for the period |
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$ 1,320,680
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$ 1,346,043
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| Ratio to average net assets: |
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| Net investment income |
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11.88%
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9.13%
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| Total expenses, before waivers/reimbursements |
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16.99%
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12.42%
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| Total expenses, net of waivers/reimbursements |
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16.66%
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12.05%
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| Asset coverage ratio |
181.68%
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181.68%
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181.68%
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181.68%
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178.75%
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178.75%
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| Portfolio turnover |
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3.84%
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9.10%
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| Unsecured Notes |
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| Ratio to average net assets: |
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| Average debt outstanding |
$ 439,852
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$ 524,687
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$ 455,091
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$ 518,130
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| SBA-guaranteed debentures |
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| Ratio to average net assets: |
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| Average debt outstanding |
300,000
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300,000
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300,000
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300,000
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| Convertible Notes |
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| Ratio to average net assets: |
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| Average debt outstanding |
376,816
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201,250
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352,949
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201,250
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| Holdings Credit Facility |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
574,263
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574,263
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$ 618,963
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| Holdings Credit Facility | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
574,263
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574,263
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618,963
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| Holdings Credit Facility | Credit Facility | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Average debt outstanding |
612,623
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583,817
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623,325
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567,033
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| DB Credit Facility |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
186,400
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186,400
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186,400
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| DB Credit Facility | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
186,400
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186,400
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186,400
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| DB Credit Facility | Credit Facility | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Average debt outstanding |
186,400
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217,157
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186,400
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227,156
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| NMFC Credit Facility |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
91,290
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91,290
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40,359
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| NMFC Credit Facility | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
91,290
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91,290
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£ 22,850
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€ 700
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40,359
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£ 22,850
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€ 700
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£ 18,800
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€ 0
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| NMFC Credit Facility | Credit Facility | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Average debt outstanding |
69,445
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144,278
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85,148
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148,401
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| NMNLC Credit Facility II |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
2,926
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2,926
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$ 3,785
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| NMNLC Credit Facility II | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Credit facility outstanding balance |
2,926
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2,926
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| NMNLC Credit Facility II | Credit Facility | Revolving Credit Facility |
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| Ratio to average net assets: |
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| Average debt outstanding |
$ 2,386
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$ 9,747
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$ 2,678
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$ 12,459
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