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INVESTMENTS - Schedule of Composition of Investment Portfolio at Cost And Fair Value (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Cost $ 2,576,197 $ 2,562,398 [1]
Fair Value $ 2,521,635 $ 2,448,935 [1]
Percentage of Total Net Assets 210.40% [2] 205.40% [1]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 1,256,876 $ 1,209,063
Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost 453,722 949,279
Fair Value 415,631 890,911
Sierra JV    
Schedule of Investments [Line Items]    
Cost 99,026 125,220
Fair Value $ 91,902 $ 110,047
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Cost $ 1,751,992 $ 1,752,943
Fair Value $ 1,700,689 $ 1,696,192
Percentage of Total Net Assets 142.00% 142.00%
Senior debt and 1st lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,237,158 $ 1,177,895
Fair Value 1,197,052 1,123,760
Senior debt and 1st lien notes | Sierra JV    
Schedule of Investments [Line Items]    
Cost 99,026 125,220
Fair Value $ 91,902 $ 110,047
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 68.00% 69.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 93.00% 91.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 67.00% 69.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 94.00% 92.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Cost $ 277,176 $ 326,639
Fair Value $ 257,633 $ 263,139
Percentage of Total Net Assets 21.00% 22.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 23,479 $ 23,141
Fair Value $ 22,221 $ 21,659
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 11.00% 13.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.00% 11.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Structured products    
Schedule of Investments [Line Items]    
Cost $ 105,045 $ 88,805
Fair Value $ 89,731 $ 73,550
Percentage of Total Net Assets 7.00% 6.00%
Structured products | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 3.00%
Structured products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 3.00%
Equity shares    
Schedule of Investments [Line Items]    
Cost $ 293,210 $ 230,188
Fair Value $ 355,690 $ 284,570
Percentage of Total Net Assets 30.00% 24.00%
Equity shares | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 449 $ 8,521
Fair Value $ 417 $ 2,458
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 11.00% 9.00%
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 14.00% 12.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants    
Schedule of Investments [Line Items]    
Cost $ 178 $ 178
Fair Value $ 1,246 $ 1,057
Percentage of Total Net Assets 0.00% 0.00%
Equity warrants | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 31 $ 31
Fair Value $ 185 $ 158
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Cost $ 148,596 $ 163,645
Fair Value $ 116,646 $ 130,427
Percentage of Total Net Assets 10.00% 11.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.00% 6.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.00% 5.00%
Investment in joint ventures | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 55,638 $ 75,941
Fair Value $ 37,001 $ 61,028
Investment in joint ventures | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 6.00%
Investment in joint ventures | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.00% 5.00%
Short-term investments | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 17,514 $ 10,826
Fair Value $ 17,514 $ 10,826
Short-term investments | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Short-term investments | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Portfolio Investments | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,334,269 $ 1,296,355
Fair Value $ 1,274,390 $ 1,219,889
Portfolio Investments | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Portfolio Investments | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost $ 419,651 $ 864,625
Fair Value $ 384,251 $ 811,358
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 92.00% 91.00%
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 92.00% 91.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost $ 34,071 $ 84,654
Fair Value $ 31,380 $ 79,553
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.00% 9.00%
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.00% 9.00%
[1] All of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.
[2] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the nine months ended September 30, 2023 in which the portfolio company is deemed to be a “Control Investment” of the Company were as follows:
December 31, 2022
Value		Gross Additions
(a)		Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)September 30, 2023
Value		Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Black Angus Steakhouses, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 9.00%, 14.3% Cash)
$5,647 $417 $— $— $— $6,064 $688 
First Lien Senior Secured Term Loan (10.0% PIK)(e)
9,147 — — — (3,007)6,140 — 
LLC Units (44.6 units)
— — — — — — — 
14,794 417 — — (3,007)12,204 688 
MVC Automotive Group GmbH(d)
Bridge Loan (4.5% Cash, 1.5% PIK)
7,149 2,467 — — — 9,616 439 
Common Equity Interest (18,000 Shares)
9,675 — — — 4,863 14,538 — 
16,824 2,467 — — 4,863 24,154 439 
MVC Private Equity Fund LP
General Partnership Interest
(1,831.4 units)
45 — (15)— (6)24 80 
Limited Partnership Interest
(71,790.4 units)
1,793 — (580)— (232)981 — 
1,838 — (595)— (238)1,005 80 
Security Holdings B.V(d)
Bridge Loan (5.0% PIK,)
6,020 152 — — — 6,172 230 
2023 Revolver (6.0% Cash)
— 3,293 — — (117)3,176 71 
Senior Subordinated Term Loan (3.1% PIK)
10,534 313 — — — 10,847 283 
Senior Unsecured Term Loan (6.0% Cash, 9.0% PIK)
2,015 153 — — (26)2,142 266 
Common Stock Series A (17,100 shares)
575 — — — (202)373 — 
Common Stock Series B (1,236 shares)
53,728 — — — (18,938)34,790 — 
72,872 3,911 — — (19,283)57,500 850 
Total Control Investments$106,328 $6,795 $(595)$— $(17,665)$94,863 $2,057 
(a) Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.