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Borrowings - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 18, 2022
USD ($)
Jun. 23, 2021
USD ($)
Apr. 30, 2021
USD ($)
Dec. 18, 2019
USD ($)
Jul. 18, 2019
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2024
USD ($)
CoverageTest
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Apr. 29, 2022
Apr. 28, 2022
Dec. 31, 2021
USD ($)
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%     6.90%     7.00%              
Weighted average maturity on debt outstanding                 3 years 1 month 6 days     3 years 8 months 12 days              
Principal amount of borrowings           $ 91,391,000     $ 91,391,000     $ 91,225,000              
Long-term debt           282,643,000     282,643,000     322,410,000              
Gain (Loss) on Extinguishment of Debt           (39,000) [1] $ (218,000) [1] $ 900,000 (252,000) [1] $ (218,000) [1]   (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]                                      
Aggregate principal amount           92,000,000     92,000,000     92,000,000 $ 92,000,000     $ 80,571,000 $ 49,321,000   $ 79,571,000
Unamortized debt offering costs           609,000     609,000     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     92,000,000              
Fair value of borrowings, but not carried           92,500,000     92,500,000                    
Long-term debt           91,391,000     $ 91,391,000     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           18,102,000     $ 18,102,000     $ 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           2,871,000     $ 2,871,000     $ 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]                                      
Debt instrument, issuance date                 Apr. 30, 2021                    
Debt discount   $ 2,400,000       974,000     $ 974,000     1,225,000              
Debt offering costs   1,200,000                                  
Fair value of outstanding debt           100,500,000     100,500,000     106,200,000              
Unamortized debt offering costs           430,000     430,000     561,000              
Long-term debt           106,596,000     106,596,000     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     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%                    
6.125% Notes Due 2022 | Unsecured Debt                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount                                 76,726,000   $ 77,407,000
2018-2 Secured Notes                                      
Debt Instrument [Line Items]                                      
Aggregate principal amount           $ 85,070,000     $ 85,070,000     125,683,000 $ 178,163,000     $ 163,863,000 $ 251,863,000 312,000,000  
Debt discount           414,000     414,000     712,000              
Debt Instrument redemption, amount               $ 88,000,000       52,500,000              
Debt Instrument redemption, amount           6,600,000 23,600,000   40,600,000 30,500,000                  
Long-term debt           84,656,000     $ 84,656,000     $ 124,971,000              
Gain (Loss) on Extinguishment of Debt             $ 200,000     $ 200,000                  
Number of coverage tests | CoverageTest                 20                    
2018-2 Secured Notes | Maximum                                      
Debt Instrument [Line Items]                                      
Gain (Loss) on Extinguishment of Debt           $ (100,000)     $ (300,000)                    
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.