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INVESTMENTS - Investment Portfolio at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Fair Value	$ 2,556,114	$ 2,448,935
Senior debt and 1st lien notes
Summary of Investment Holdings [Line Items]
Fair Value	1,765,238	1,696,192
Subordinated debt and 2nd lien notes
Summary of Investment Holdings [Line Items]
Fair Value	255,089	263,139
Structured products
Summary of Investment Holdings [Line Items]
Fair Value	79,343	73,550
Equity shares
Summary of Investment Holdings [Line Items]
Fair Value	331,880	284,570
Equity warrants
Summary of Investment Holdings [Line Items]
Fair Value	1,056	1,057
Investments Subject to Leveling
Summary of Investment Holdings [Line Items]
Fair Value	2,432,606	2,318,508
Investment in joint ventures / PE fund
Summary of Investment Holdings [Line Items]
Fair Value	123,508	130,427
Level 1 | Senior debt and 1st lien notes
Summary of Investment Holdings [Line Items]
Fair Value	0	0
Level 1 | Subordinated debt and 2nd lien notes
Summary of Investment Holdings [Line Items]
Fair Value	0	0
Level 1 | Structured products
Summary of Investment Holdings [Line Items]
Fair Value	0	0
Level 1 | Equity shares
Summary of Investment Holdings [Line Items]
Fair Value	145	164
Level 1 | Equity warrants
Summary of Investment Holdings [Line Items]
Fair Value	0	0
Level 1 | Investments Subject to Leveling
Summary of Investment Holdings [Line Items]
Fair Value	145	164
Level 2 | Senior debt and 1st lien notes
Summary of Investment Holdings [Line Items]
Fair Value	114,877	104,836
Level 2 | Subordinated debt and 2nd lien notes
Summary of Investment Holdings [Line Items]
Fair Value	29,355	28,925
Level 2 | Structured products
Summary of Investment Holdings [Line Items]
Fair Value	53,227	55,723
Level 2 | Equity shares
Summary of Investment Holdings [Line Items]
Fair Value	2,751	1,339
Level 2 | Equity warrants
Summary of Investment Holdings [Line Items]
Fair Value	0	0
Level 2 | Investments Subject to Leveling
Summary of Investment Holdings [Line Items]
Fair Value	200,210	190,823
Level 3 | Senior debt and 1st lien notes
Summary of Investment Holdings [Line Items]
Fair Value	1,650,361	1,591,356
Level 3 | Subordinated debt and 2nd lien notes
Summary of Investment Holdings [Line Items]
Fair Value	225,734	234,214
Level 3 | Structured products
Summary of Investment Holdings [Line Items]
Fair Value	26,116	17,827
Level 3 | Equity shares
Summary of Investment Holdings [Line Items]
Fair Value	328,984	283,067
Level 3 | Equity warrants
Summary of Investment Holdings [Line Items]
Fair Value	1,056	1,057
Level 3 | Investments Subject to Leveling
Summary of Investment Holdings [Line Items]
Fair Value	$ 2,232,251	$ 2,127,521

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- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5D
-Subparagraph (SX 210.12-13D(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column C))
-URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

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