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INVESTMENTS - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Cost	$ 2,658,484	$ 2,562,398
Fair Value	$ 2,556,114	$ 2,448,935
% of Net Assets	212.10%	205.40%
Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Fair Value	$ 1,212,132	$ 1,209,063
Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	696,008	949,279
Fair Value	664,111	890,911
Sierra JV
Summary of Investment Holdings [Line Items]
Cost	119,673	125,220
Fair Value	$ 106,251	$ 110,047
Cost | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Cost | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Fair Value | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Senior debt and 1st lien notes
Summary of Investment Holdings [Line Items]
Cost	$ 1,813,687	$ 1,752,943
Fair Value	$ 1,765,238	$ 1,696,192
% of Net Assets	146.00%	142.00%
Senior debt and 1st lien notes | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 1,175,878	$ 1,177,895
Fair Value	1,133,366	1,123,760
Senior debt and 1st lien notes | Sierra JV
Summary of Investment Holdings [Line Items]
Cost	119,673	125,220
Fair Value	$ 106,251	$ 110,047
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	68.00%	69.00%
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	92.00%	91.00%
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	69.00%	69.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	93.00%	92.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Subordinated debt and 2nd lien notes
Summary of Investment Holdings [Line Items]
Cost	$ 318,480	$ 326,639
Fair Value	$ 255,089	$ 263,139
% of Net Assets	21.00%	22.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 24,151	$ 23,141
Fair Value	$ 23,096	$ 21,659
Subordinated debt and 2nd lien notes | Cost | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	12.00%	13.00%
Subordinated debt and 2nd lien notes | Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	2.00%	2.00%
Subordinated debt and 2nd lien notes | Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	10.00%	11.00%
Subordinated debt and 2nd lien notes | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	2.00%	2.00%
Structured products
Summary of Investment Holdings [Line Items]
Cost	$ 96,896	$ 88,805
Fair Value	$ 79,343	$ 73,550
% of Net Assets	7.00%	6.00%
Structured products | Cost | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	4.00%	3.00%
Structured products | Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	3.00%	3.00%
Equity shares
Summary of Investment Holdings [Line Items]
Cost	$ 274,704	$ 230,188
Fair Value	$ 331,880	$ 284,570
% of Net Assets	28.00%	24.00%
Equity shares | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 8,555	$ 8,521
Fair Value	$ 6,911	$ 2,458
Equity shares | Cost | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	10.00%	9.00%
Equity shares | Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	0.00%	0.00%
Equity shares | Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	13.00%	12.00%
Equity shares | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	0.00%	0.00%
Equity warrants
Summary of Investment Holdings [Line Items]
Cost	$ 178	$ 178
Fair Value	$ 1,056	$ 1,057
% of Net Assets	0.00%	0.00%
Equity warrants | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 31	$ 31
Fair Value	$ 108	$ 158
Equity warrants | Cost | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	0.00%	0.00%
Equity warrants | Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	0.00%	0.00%
Equity warrants | Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	0.00%	0.00%
Equity warrants | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	0.00%	0.00%
Investment in joint ventures / PE fund
Summary of Investment Holdings [Line Items]
Cost	$ 154,539	$ 163,645
Fair Value	$ 123,508	$ 130,427
% of Net Assets	10.00%	11.00%
Investment in joint ventures / PE fund | Cost | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	6.00%	6.00%
Investment in joint ventures / PE fund | Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	5.00%	5.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	$ 634,664	$ 864,625
Fair Value	$ 605,542	$ 811,358
Federal Housing Administration (“FHA”) loans | Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	91.00%	91.00%
Federal Housing Administration (“FHA”) loans | Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	91.00%	91.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	$ 61,344	$ 84,654
Fair Value	$ 58,569	$ 79,553
Veterans Affairs (“VA”) loans | Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	9.00%	9.00%
Veterans Affairs (“VA”) loans | Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	9.00%	9.00%
Investment in joint ventures | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 63,690	$ 75,941
Fair Value	$ 48,651	$ 61,028
Investment in joint ventures | Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	5.00%	6.00%
Investment in joint ventures | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	4.00%	5.00%
Short-Term Investments | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 9,946	$ 10,826
Fair Value	$ 9,946	$ 10,826
Short-Term Investments | Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	1.00%	1.00%
Short-Term Investments | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	1.00%	1.00%
Short-term investments | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 1,282,251	$ 1,296,355
Fair Value	$ 1,222,078	$ 1,219,889
Short-term investments | Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%
Short-term investments | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percentage of Total Portfolio	100.00%	100.00%

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