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Financial Highlights (Details) $ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2024 EUR (€) shares	Jun. 30, 2024 GBP (£) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2023 EUR (€) shares	Dec. 31, 2023 GBP (£) shares	Jun. 30, 2023 EUR (€) shares	Jun. 30, 2023 GBP (£) shares	Jun. 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			0.72	0.77
Net realized and unrealized gains (losses) (in dollars per share) | $ / shares			(0.15)	0.02
Total net increase (in dollars per share) | $ / shares			0.57	0.79
Distributions declared to stockholders from net investment income (in dollars per share) | $ / shares			(0.70)	(0.67)
Net asset value, ending balance (in dollars per share) | $ / shares	$ 12.74	$ 13.14	12.74	$ 13.14
Per share market value (in dollars per share) | $ / shares	$ 12.24		$ 12.24									$ 12.44
Total return based on market value			1.71%	6.04%
Total return based on net asset value			4.50%	6.09%
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	100,937,026	100,937,026
Average weighted shares outstanding for the period - basic (in shares) | shares			105,276,077	100,937,026
Average net assets for the period			$ 1,349,273	$ 1,320,680
Ratio to average net assets:
Net investment income			11.26%	11.88%
Total expenses, before waivers/reimbursements			16.53%	16.99%
Total expenses, net of waivers/reimbursements			16.26%	16.66%
Asset coverage ratio	182.80%		182.80%		182.80%	182.80%				181.68%	181.68%
Portfolio turnover			14.94%	3.84%
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	$ 690,000	$ 439,852	$ 661,305	$ 455,091
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	376,816	260,000	352,949
Holdings Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	386,563		386,563				$ 515,063
Holdings Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	386,563		386,563				515,063
Holdings Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	328,651	612,623	343,570	623,325
DB Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	182,000		182,000				186,400
DB Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	182,000		182,000				186,400
DB Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	182,000	186,400	183,547	186,400
NMFC Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	141,840		141,840				36,813
NMFC Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	141,840		141,840		€ 17,400	£ 26,650	36,813	€ 700	£ 22,850	€ 700	£ 22,850
NMFC Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	63,131	69,445	49,430	85,148
NMNLC Credit Facility II
Ratio to average net assets:
Credit facility outstanding balance	2,948		2,948				2,853
NMNLC Credit Facility II | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	2,948		2,948				$ 2,853
NMNLC Credit Facility II | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	$ 2,505	$ 2,386	$ 2,438	$ 2,678

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