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Financial Highlights (Details) $ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2024 GBP (£) shares	Sep. 30, 2024 EUR (€) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2023 GBP (£) shares	Dec. 31, 2023 EUR (€) shares	Sep. 30, 2023 GBP (£) shares	Sep. 30, 2023 EUR (€) shares	Sep. 30, 2023 $ / shares
Investment Company, Financial Highlights [Roll Forward]
Net asset value, beginning balance (in dollars per share) | $ / shares			$ 12.87	$ 13.02
Net investment income (in dollars per share) | $ / shares			1.05	1.17
Net realized and unrealized losses (in dollars per share) | $ / shares			(0.26)	(0.10)
Total net increase (in dollars per share) | $ / shares			0.79	1.07
Distributions declared to stockholders from net investment income (in dollars per share) | $ / shares			(1.04)	(1.03)
Net asset value, ending balance (in dollars per share) | $ / shares	$ 12.62	$ 13.06	12.62	$ 13.06
Per share market value (in dollars per share) | $ / shares	$ 11.98		$ 11.98									$ 12.95
Total return based on market value			2.40%	13.49%
Total return based on net asset value			6.32%	8.39%
Shares outstanding at end of period (in shares) | shares	107,851,415		107,851,415		107,851,415	107,851,415	102,558,859	102,558,859	102,558,859	101,439,649	101,439,649
Average weighted shares outstanding for the period (in shares) | shares			106,140,789	100,943,049
Average net assets for the period			$ 1,357,569	$ 1,322,558
Ratio to average net assets:
Net investment income			10.93%	11.95%
Total expenses, before waivers/reimbursements			16.90%	16.77%
Total expenses, net of waivers/reimbursements			16.63%	16.45%
Asset coverage ratio	179.18%		179.18%		179.18%	179.18%				182.68%	182.68%
Portfolio turnover			17.99%	4.36%
Accretive effect of common stock issuances per share (in dollars per share) | $ / shares			$ (0.02)	$ 0.00
Unsecured Notes
Ratio to average net assets:
Average debt outstanding	$ 706,304	$ 391,500	$ 676,414	$ 433,661
SBA-guaranteed debentures
Ratio to average net assets:
Average debt outstanding	300,000	300,000	300,000	300,000
Convertible Notes
Ratio to average net assets:
Average debt outstanding	260,000	317,138	260,000	340,881
Holdings Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	407,563		407,563				$ 515,063
Holdings Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	407,563		407,563				515,063
Holdings Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	405,661	563,470	364,418	603,154
DB Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	0		0				186,400
DB Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	0		0				186,400
DB Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	180,022	186,487	182,364	186,429
NMFC Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	55,031		55,031				36,813
NMFC Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	55,031		55,031		£ 26,650	€ 17,400	36,813	£ 22,850	€ 700	£ 22,850	€ 700
NMFC Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	140,385	141,764	79,969	104,227
NMNLC Credit Facility II
Ratio to average net assets:
Credit facility outstanding balance	2,908		2,908				2,853
NMNLC Credit Facility II | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	2,908		2,908				$ 2,853
NMNLC Credit Facility II | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	$ 2,151	$ 2,091	$ 2,341	$ 2,480

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