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
 1 Months Ended 3 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Mar. 31, 2022
Old World Christmas, Inc.          
New investments, repayments and settlements:          
Realized gain on preferred equity $ 300        
Total          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 800,047 $ 800,047 $ 689,425 $ 753,516 $ 714,322
New investments, repayments and settlements:          
Issuances / originations   47,975 27,805    
Settlements / repayments   0 (48,000)    
Sales   (1,775) (9,628)    
Transfers   0 0    
Ending balance 800,047 800,047 689,425    
Total | Debt and Equity Securities, Realized Gain (Loss)          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gain (loss)   1,155 4,728    
Total | Debt and Equity Securities, Unrealized Gain (Loss)          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gain (loss)   (731) 12,448    
Reversal of previously recorded (appreciation) depreciation upon realization   (93) (12,250)    
Secured First Lien Debt          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 452,215 452,215 376,752 437,517 425,087
New investments, repayments and settlements:          
Issuances / originations   14,700 6,800    
Settlements / repayments   0 (48,000)    
Sales   0 0    
Transfers   0 0    
Ending balance 452,215 452,215 376,752    
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)   (2) (7,135)    
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 104,794 104,794 67,936 75,734 67,958
New investments, repayments and settlements:          
Issuances / originations   25,000 5    
Settlements / repayments   0 0    
Sales   0 0    
Transfers   0 0    
Ending balance 104,794 104,794 67,936    
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)   4,060 (27)    
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 214,258 214,258 238,665 222,585 217,599
New investments, repayments and settlements:          
Issuances / originations   3,275 21,000    
Settlements / repayments   0 0    
Sales   (273) (9,628)    
Transfers   0 0    
Ending balance 214,258 214,258 238,665    
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)   273 4,728    
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)   (11,602) 17,216    
Reversal of previously recorded (appreciation) depreciation upon realization   0 (12,250)    
Common Equity/ Equivalents          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 28,780 28,780 6,072 $ 17,680 $ 3,678
New investments, repayments and settlements:          
Issuances / originations   5,000 0    
Settlements / repayments   0 0    
Sales   (1,502) 0    
Transfers   0 0    
Ending balance $ 28,780 28,780 6,072    
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)   882 0    
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)   6,813 2,394    
Reversal of previously recorded (appreciation) depreciation upon realization   $ (93) $ 0