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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 ($)
Jul. 18, 2019
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2023
USD ($)
CoverageTest
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Apr. 29, 2022
Apr. 28, 2022
Dec. 31, 2021
USD ($)
Jul. 23, 2021
USD ($)
Jun. 24, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                                          
Weighted average stated interest rate on debt outstanding             6.70%     6.70%   6.10%                  
Weighted average maturity on debt outstanding                   4 years 4 months 24 days   5 years                  
Principal amount of borrowings             $ 77,059,000     $ 77,059,000   $ 90,893,000                  
Long-term debt             329,634,000     329,634,000   373,308,000                  
Gain (Loss) on Extinguishment of Debt             (218,000)     (218,000) [1]                      
GLPRF LLC | SOFR                                          
Debt Instrument [Line Items]                                          
Effective interest                           2.80% 2.85%            
CLO Facility | GARS Acquisition                                          
Debt Instrument [Line Items]                                          
Aggregate principal amount                                       $ 420,000,000.0  
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             78,000,000     78,000,000   92,000,000 $ 79,000,000     $ 80,571,000     $ 49,321,000   $ 79,571,000
Interest rate         2.85%                                
Unamortized debt offering costs             941,000     $ 941,000   1,107,000                  
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     $ 215,000,000                    
Maturity date                   Dec. 18, 2023                      
Principal amount of borrowings             78,000,000.0     $ 78,000,000.0                      
Interest and fees expense             1,800,000 $ 900,000   3,600,000 $ 1,600,000                    
Long-term debt             77,059,000     77,059,000   $ 90,893,000                  
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Level III                                          
Debt Instrument [Line Items]                                          
Fair value of borrowings             77,100,000     $ 77,100,000                      
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   $ 18,103,000                  
2018-2 Secured Notes Class A-1R-R Notes                                          
Debt Instrument [Line Items]                                          
Aggregate principal amount           $ 50,000,000.0                              
Stated Maturity                   Nov. 20, 2029 [2]   Nov. 20, 2029 [3]                  
Long-term debt             18,203,000     $ 18,203,000   $ 25,671,000                  
Debt instrument converted amount           25,000,000.0                              
Drew Amount $ 14,300,000                                        
Debt Instrument redemption, amount           $ 25,000,000.0                              
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   $ 2,430,000         1,467,000     $ 1,467,000   1,704,000                  
Debt offering costs   1,200,000                                      
Fair value of outstanding debt             105,800,000     105,800,000                      
Unamortized debt offering costs             692,000     692,000   818,000                  
Long-term debt             105,841,000     105,841,000   105,478,000                  
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%                    
Debt instrument, frequency of periodic payment                   quarterly                      
Debt offering costs       $ 2,900,000                                  
Debt Instrument redemption, amount       $ 77,400,000                                  
Debt instrument, redemption start date       Apr. 30, 2021                                  
Debt instrument, redemption end date       May 30, 2021                                  
Gain (Loss) on Extinguishment of Debt       $ 1,000,000.0                                  
6.125% Notes Due 2022 | Unsecured Debt                                          
Debt Instrument [Line Items]                                          
Aggregate principal amount                 $ 77,400,000                   76,726,000   $ 77,407,000
Interest rate                 6.125%                        
Proceeds from offering of notes                 $ 74,600,000                        
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 $ 28,750,000      
2018-2 Secured Notes                                          
Debt Instrument [Line Items]                                          
Aggregate principal amount             147,672,000     $ 147,672,000   178,163,000 $ 171,288,000     $ 163,863,000     $ 251,863,000 312,000,000.0  
Debt discount             938,000     938,000   1,226,000                  
Long-term debt             $ 146,734,000     $ 146,734,000   $ 176,937,000                  
Number of coverage tests | CoverageTest                   20                      
2018-2 Subordinated Notes                                          
Debt Instrument [Line Items]                                          
Aggregate principal amount                                       $ 108,000,000.0  
[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.