Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Schedule of Debt (Details)

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BORROWINGS - Schedule of Debt (Details) - USD ($)
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Aug. 31, 2021
Mar. 31, 2021
Debt Instrument [Line Items]          
Aggregate Principal Amount $ 292,088,000   $ 267,584,000    
Total borrowings $ 286,719,000 $ 261,348,000      
Indebtedness asset coverage on our senior securities 250.50% 252.90%      
Notes Payable          
Debt Instrument [Line Items]          
Notes Outstanding $ 10,499,500,000 $ 10,499,500,000      
Aggregate Principal Amount 262,488,000 262,488,000      
Less: Unamortized Discounts (5,369,000) (6,236,000)      
Total borrowings $ 257,119,000 $ 256,252,000      
Notes Payable | 5.00% Notes due 2026          
Debt Instrument [Line Items]          
Interest Rate 5.00% 5.00%     5.00%
Notes Outstanding $ 5,117,500,000 $ 5,117,500,000      
Principal Amount per Note 25,000.00 25,000.00      
Aggregate Principal Amount $ 127,938,000 $ 127,938,000     $ 127,900,000
Notes Payable | 4.875% Notes due 2028          
Debt Instrument [Line Items]          
Interest Rate 4.875% 4.875%   4.875%  
Notes Outstanding $ 5,382,000,000 $ 5,382,000,000      
Principal Amount per Note 25,000.00 25,000.00      
Aggregate Principal Amount $ 134,550,000 $ 134,550,000   $ 134,600,000