Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details)

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INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Mar. 31, 2023
Old World Christmas, Inc.        
New investments, repayments and settlements:        
Realized gain (loss) on preferred equity   $ 300    
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 899,138 800,047 $ 920,486 $ 753,516
New investments, repayments and settlements:        
Issuances / originations 598 47,975    
Settlements / repayments (3,000) 0    
Sales 0 (1,775)    
Transfers 0 0    
Ending balance 899,138 800,047    
Total | Debt and Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 0 1,155    
Total | Debt and Equity Securities, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) (18,946) (731)    
Reversal of previously recorded (appreciation) depreciation upon realization 0 (93)    
Secured First Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 463,219 452,215 474,856 437,517
New investments, repayments and settlements:        
Issuances / originations 598 14,700    
Settlements / repayments (3,000) 0    
Sales 0 0    
Transfers 0 0    
Ending balance 463,219 452,215    
Secured First Lien Debt | Debt and Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 0 0    
Secured First Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) (9,235) (2)    
Reversal of previously recorded (appreciation) depreciation upon realization 0 0    
Secured Second Lien Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 137,827 104,794 138,703 75,734
New investments, repayments and settlements:        
Issuances / originations 0 25,000    
Settlements / repayments 0 0    
Sales 0 0    
Transfers 0 0    
Ending balance 137,827 104,794    
Secured Second Lien Debt | Debt and Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 0 0    
Secured Second Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) (876) 4,060    
Reversal of previously recorded (appreciation) depreciation upon realization 0 0    
Preferred Equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 212,591 214,258 213,480 222,585
New investments, repayments and settlements:        
Issuances / originations 0 3,275    
Settlements / repayments 0 0    
Sales 0 (273)    
Transfers 0 0    
Ending balance 212,591 214,258    
Preferred Equity | Debt and Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 0 273    
Preferred Equity | Debt and Equity Securities, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) (889) (11,602)    
Reversal of previously recorded (appreciation) depreciation upon realization 0 0    
Common Equity/ Equivalents        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 85,501 28,780 $ 93,447 $ 17,680
New investments, repayments and settlements:        
Issuances / originations 0 5,000    
Settlements / repayments 0 0    
Sales 0 (1,502)    
Transfers 0 0    
Ending balance 85,501 28,780    
Common Equity/ Equivalents | Debt and Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 0 882    
Common Equity/ Equivalents | Debt and Equity Securities, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) (7,946) 6,813    
Reversal of previously recorded (appreciation) depreciation upon realization $ 0 $ (93)