Quarterly report pursuant to Section 13 or 15(d)

DEBT - SBIC Debentures (Details)

v3.23.1
DEBT - SBIC Debentures (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Payable $ 1,998,000,000 $ 2,007,000,000
Recorded value 1,989,641,000 $ 1,999,102,000
Unsecured Notes    
Debt Instrument [Line Items]    
Debt instrument, weighted-average annual interest rate   2.90%
Unsecured Notes | SBIC Debentures    
Debt Instrument [Line Items]    
Payable $ 334,000,000 $ 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  
Face amount $ 334,000,000 350,000,000
Recorded value 328,206,000 $ 343,914,000
Unsecured Notes | SBIC Debentures | Maximum    
Debt Instrument [Line Items]    
Payable 350,000,000  
Unsecured Notes | SBIC Debentures | MSMF    
Debt Instrument [Line Items]    
Face amount 159,000,000  
Recorded value 156,200,000  
Unamortized debt issuance costs 2,800,000  
Unsecured Notes | SBIC Debentures | MSC III    
Debt Instrument [Line Items]    
Face amount 175,000,000  
Recorded value 172,000,000  
Unamortized debt issuance costs $ 3,000,000