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Financial Highlights (Details) $ / shares in Units, € in Thousands, £ in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2023 GBP (£) shares	Mar. 31, 2023 EUR (€) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 GBP (£) shares	Dec. 31, 2022 EUR (€) shares	Mar. 31, 2022 GBP (£) shares	Mar. 31, 2022 EUR (€) shares	Mar. 31, 2022 $ / shares
Investment Company, Financial Highlights [Roll Forward]
Net asset value, beginning balance (in dollars per share) | $ / shares	$ 13.02	$ 13.49
Net investment income (in dollars per share) | $ / shares	0.38	0.30
Net realized and unrealized (losses) gains (in dollars per share) | $ / shares	0.06	0.07
Total net increase (in dollars per share) | $ / shares	0.44	0.37
Distributions declared to stockholders from net investment income (in dollars per share) | $ / shares	(0.32)	(0.30)
Net asset value, ending balance (in dollars per share) | $ / shares	13.14	$ 13.56
Per share market value (in dollars per share) | $ / shares	$ 12.17									$ 13.85
Total return based on market value	0.94%	3.28%
Total return based on net asset value	3.39%	2.76%
Shares outstanding at end of period (in shares) | shares	100,937,026		100,937,026	100,937,026	100,937,026	100,937,026	100,937,026	99,498,562	99,498,562
Average weighted shares outstanding for the period - basic (in shares) | shares	100,937,026	98,413,476
Average net assets for the period	$ 1,314,609	$ 1,321,557
Ratio to average net assets:
Net investment income	11.76%	9.08%
Total expenses, before waivers/reimbursements	16.85%	12.38%
Total expenses, net of waivers/reimbursements	16.52%	11.98%
Asset coverage ratio	177.55%		177.55%	177.55%				181.26%	181.26%
Portfolio turnover	2.10%	2.94%
Unsecured Notes
Ratio to average net assets:
Average debt outstanding	$ 471,500	$ 511,500
SBA-guaranteed debentures
Ratio to average net assets:
Average debt outstanding	300,000	300,000
Convertible Notes
Ratio to average net assets:
Average debt outstanding	328,816	201,250
Holdings Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	614,663				$ 618,963
Holdings Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	614,663				618,963
Holdings Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	634,146	550,063
DB Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	186,400				186,400
DB Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	186,400				186,400
DB Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	186,400	237,267
NMFC Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	87,949				40,359
NMFC Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	87,949		£ 22,850	€ 700	40,359	£ 22,850	€ 700	£ 17,400	€ 0
NMFC Credit Facility | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	101,025	152,570
NMNLC Credit Facility II
Ratio to average net assets:
Credit facility outstanding balance	3,120				$ 3,785
NMNLC Credit Facility II | Revolving Credit Facility
Ratio to average net assets:
Credit facility outstanding balance	3,120
NMNLC Credit Facility II | Credit Facility | Revolving Credit Facility
Ratio to average net assets:
Average debt outstanding	$ 2,973	$ 15,200

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