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INVESTMENTS - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Summary of Investment Holdings [Line Items]    
Cost $ 2,430,904 [1] $ 1,787,824 [2]
Fair value of investment owned $ 2,332,492 [1] $ 1,800,594 [2]
% of Net Assets 189.90% 242.70%
Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned $ 1,213,233 $ 1,245,647
Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Cost 1,231,727 3,024,529
Fair value of investment owned 1,152,010 $ 3,063,035
Sierra JV    
Summary of Investment Holdings [Line Items]    
Cost 129,684  
Fair value of investment owned $ 115,670  
Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00%  
Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00%  
Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Cost $ 1,609,541 $ 1,217,899
Fair value of investment owned $ 1,557,396 $ 1,221,598
% of Net Assets 127.00% 165.00%
Senior debt and 1st lien notes | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 1,191,919 $ 1,084,502
Fair value of investment owned 1,107,318 $ 1,085,172
Senior debt and 1st lien notes | Sierra JV    
Summary of Investment Holdings [Line Items]    
Cost 129,684  
Fair value of investment owned $ 115,670  
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 66.00% 68.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 91.00% 87.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00%  
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 67.00% 68.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 91.00% 86.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00%  
Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Cost $ 339,312 $ 253,551
Fair value of investment owned $ 279,838 $ 240,037
% of Net Assets 23.00% 32.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 23,921 $ 23,607
Fair value of investment owned $ 22,960 $ 24,011
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 14.00% 14.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | 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 | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 12.00% 13.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | 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 $ 81,105 $ 37,055
Fair value of investment owned $ 67,811 $ 40,271
% of Net Assets 5.00% 6.00%
Structured products | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost   $ 4,569
Fair value of investment owned   $ 5,410
Structured products | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 4.00% 2.00%
Structured products | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio   0.00%
Structured products | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 3.00% 2.00%
Structured products | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio   1.00%
Equity shares    
Summary of Investment Holdings [Line Items]    
Cost $ 225,140 $ 145,791
Fair value of investment owned $ 279,564 $ 154,477
% of Net Assets 23.00% 21.00%
Equity shares | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 4,398 $ 5,448
Fair value of investment owned $ 2,741 $ 3,887
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 9.00% 8.00%
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 0.00% 1.00%
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 12.00% 9.00%
Equity shares | Percentage of Total Portfolio | 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 $ 1,111
Fair value of investment owned $ 44 $ 1,107
% of Net Assets 0.00% 0.00%
Equity warrants | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 31 $ 31
Fair value of investment owned $ 13 $ 75
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio | 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 $ 175,628 $ 132,417
Fair value of investment owned $ 147,839 $ 143,104
% of Net Assets 12.00% 19.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 7.00% 8.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 6.00% 8.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 1,119,118 $ 2,799,869
Fair value of investment owned $ 1,046,632 $ 2,839,495
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 91.00% 93.00%
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 91.00% 93.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 112,609 $ 224,660
Fair value of investment owned $ 105,378 $ 223,540
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 9.00% 7.00%
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 9.00% 7.00%
Investment in joint ventures | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 92,061 $ 111,490
Fair value of investment owned $ 80,201 $ 127,092
Investment in joint ventures | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 7.00% 9.00%
Investment in joint ventures | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 7.00% 10.00%
Short-term investments | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 5,860 $ 12,572
Fair value of investment owned $ 5,860 $ 12,572
Short-term investments | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 0.00% 1.00%
Short-term investments | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 0.00% 1.00%
Long-Term Investment | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Cost $ 1,318,190 $ 1,242,219
Fair value of investment owned $ 1,219,093 $ 1,258,219
Long-Term Investment | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Long-Term Investment | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC    
Summary of Investment Holdings [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
[1] Some or 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 February 2019 (as amended, restated and otherwise modified from time to time, the "February 2019 Credit Facility").
[2] Some or all of the investment is or will be encumbered as security for the Company's senior secured credit facility with ING Capital LLC.