Annual report pursuant to Section 13 and 15(d)

DEBT - SBIC Debentures Narrative (Details)

v3.22.4
DEBT - SBIC Debentures Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Payable $ 2,007,000,000 $ 1,805,000,000
Recorded Value $ 1,999,102,000 1,796,056,000
Unsecured Notes    
Debt Instrument [Line Items]    
Debt instrument, weighted-average annual interest rate 2.90%  
Unsecured Notes | SBIC debentures    
Debt Instrument [Line Items]    
Face amount $ 350,000,000 350,000,000
Payable $ 350,000,000 $ 350,000,000
Debt instrument, term 10 years  
Debt instrument, weighted-average annual interest rate   2.90%
Debt instrument, remaining term 5 years 1 month 6 days  
Recorded Value $ 343,914,000 $ 342,731,000
Unsecured Notes | SBIC debentures | MSMF    
Debt Instrument [Line Items]    
Face amount 175,000,000  
Recorded Value 172,000,000  
Unamortized debt issuance costs 3,000,000  
Unsecured Notes | SBIC debentures | MSC III    
Debt Instrument [Line Items]    
Face amount 175,000,000  
Recorded Value 171,900,000  
Unamortized debt issuance costs $ 3,100,000