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Borrowings - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 18, 2022
USD ($)
Jun. 23, 2021
USD ($)
Jun. 09, 2021
USD ($)
Apr. 30, 2021
USD ($)
Dec. 18, 2019
USD ($)
Jul. 18, 2019
USD ($)
Mar. 31, 2024
USD ($)
CoverageTest
Mar. 31, 2023
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Apr. 29, 2022
Apr. 28, 2022
Dec. 31, 2021
USD ($)
Jul. 23, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                                      
Weighted average stated interest rate on debt outstanding             6.90%       7.00%                
Weighted average maturity on debt outstanding             3 years 2 months 12 days       3 years 8 months 12 days                
Principal amount of borrowings             $ 91,308,000       $ 91,225,000                
Long-term debt             288,863,000       322,410,000                
Gain (Loss) on Extinguishment of Debt             $ (213,000) [1]   $ 900,000   (400,000)                
GLPRF LLC | SOFR                                      
Debt Instrument [Line Items]                                      
Effective interest                         2.80% 2.85%          
CLO Facility | GARS Acquisition                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount                                   $ 420,000,000  
Discount amortized over the remaining term                                   2,400,000  
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility                                      
Debt Instrument [Line Items]                                      
Weighted average stated interest rate on debt outstanding             8.13% 7.36%                      
Aggregate principal amount             $ 92,000,000       92,000,000 $ 92,000,000     $ 80,571,000   $ 49,321,000   $ 79,571,000
Unamortized debt offering costs             692,000       775,000                
Percentage of minimum commitments utilization requirement         80.00%                            
Percentage of average daily unborrowed portion of financing commitments         0.50%                            
Initial principal amount         $ 115,000,000                            
Line of Credit Facility, Maximum Borrowing Capacity                   $ 215,000,000                  
Principal amount of borrowings             92,000,000       92,000,000                
Fair value of borrowings, but not carried             92,500,000                        
Long-term debt             $ 91,308,000       91,225,000                
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Level III                                      
Debt Instrument [Line Items]                                      
Fair value of borrowings                     $ 91,200,000                
Unsecured Debt                                      
Debt Instrument [Line Items]                                      
Debt instrument, redemption price, percentage             100.00%                        
2018-2 Secured Notes Class B-R Notes                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount                                   18,300,000  
Stated Maturity             Nov. 20, 2029 [2]       Nov. 20, 2029 [3]                
Long-term debt             $ 18,103,000       $ 18,103,000                
2018-2 Secured Notes Class A-1R-R Notes                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount           $ 50,000,000                          
Stated Maturity             Nov. 20, 2029 [2]       Nov. 20, 2029 [3]                
Long-term debt             $ 4,482,000       $ 12,818,000                
Debt instrument converted amount           25,000,000                          
Drew Amount $ 14,300,000                                    
Debt Instrument redemption, amount           $ 25,000,000                          
Class A-R Notes                                      
Debt Instrument [Line Items]                                      
Percentage of aggregate amount of interest payable for first coverage test                   135.00%                  
Percentage of aggregate outstanding principal amount             128.00%                        
Class A-R Notes and B-R Notes                                      
Debt Instrument [Line Items]                                      
Percentage of aggregate amount of interest payable for first coverage test                   125.00%                  
Percentage of aggregate outstanding principal amount             118.20%                        
Class A-1R-R and Class A-1T-R Notes                                      
Debt Instrument [Line Items]                                      
Percentage of capitalization             125.00%                        
4.875% Notes due 2026                                      
Debt Instrument [Line Items]                                      
Weighted average stated interest rate on debt outstanding             4.88% 4.88%                      
Debt instrument, issuance date             Apr. 30, 2021                        
Debt discount   $ 2,400,000         $ 1,100,000       1,225,000                
Debt offering costs   1,200,000                                  
Fair value of outstanding debt             100,500,000       106,200,000                
Unamortized debt offering costs             496,000       561,000                
Long-term debt             106,404,000       106,214,000                
4.875% Notes due 2026 | Unsecured Debt                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount             $ 108,000,000       108,000,000 108,000,000     108,000,000        
Interest rate       4.875%                              
Stated Maturity             Apr. 30, 2026                        
Debt instrument, frequency of periodic payment             semi-annually                        
Debt instrument, date of first required payment             Sep. 16, 2021                        
4.875% Notes due 2026 | Private Placement                                      
Debt Instrument [Line Items]                                      
Interest rate       4.875%                              
4.875% Notes due 2026 | Private Placement | Unsecured Debt                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount   $ 28,000,000   $ 80,000,000                              
Interest rate   4.875%   4.875%                              
Proceeds from offering of notes   $ 27,400,000                                  
Proceeds from offering of notes       $ 77,700,000                              
6.125% Notes Due 2022                                      
Debt Instrument [Line Items]                                      
Interest rate       6.125%     6.125%                        
6.125% Notes Due 2022 | Unsecured Debt                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount                                 76,726,000   $ 77,407,000
HCAP Notes                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount     $ 28,750,000                                
Interest rate     6.125%                                
Stated Maturity     Sep. 15, 2022                                
Debt Instrument redemption, amount                               $ 28,750,000      
2018-2 Secured Notes                                      
Debt Instrument [Line Items]                                      
Weighted average stated interest rate on debt outstanding             7.90% 6.80%                      
Aggregate principal amount             $ 91,651,000       125,683,000 $ 178,163,000     $ 163,863,000   $ 251,863,000 312,000,000  
Debt discount             500,000       712,000                
Fair value of outstanding debt                     125,000,000                
Debt Instrument redemption, amount             34,000,000 $ 6,900,000 $ 88,000,000   52,500,000                
Fair value of borrowings, but not carried             91,500,000                        
Long-term debt             91,151,000       $ 124,971,000                
Gain (Loss) on Extinguishment of Debt             $ (200,000) $ 0                      
Number of coverage tests | CoverageTest             20                        
2018-2 Subordinated Notes                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount                                   $ 108,000,000  
[1] Refer to Note 9 "Stockholders' Equity" for additional information on changes in components of Stockholders' Equity
[2] The indenture governing our CLO permits the repricing or refinancing of the secured notes after November 20, 2020, which may result in the redemption of the outstanding notes occurring prior to their stated maturity.
[3] The indenture governing our CLO permits the repricing or refinancing of the secured notes after November 20, 2020, which may result in the redemption of the outstanding notes occurring prior to their stated maturity.