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Borrowings - Additional Information (Details)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 23, 2021
USD ($)
Jun. 09, 2021
USD ($)
Apr. 30, 2021
USD ($)
Dec. 18, 2019
USD ($)
Jul. 18, 2019
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
CoverageTest
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Apr. 29, 2022
Apr. 28, 2022
Mar. 31, 2022
USD ($)
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           5.00%         5.00%   3.20%                
Weighted average maturity on debt outstanding                     5 years 2 months 12 days   5 years 4 months 24 days                
Aggregate principal amount [2]                   $ 364,934,000 [1]           $ 352,434,000 [3]          
Principal amount of borrowings           $ 95,908,000         $ 95,908,000   $ 79,839,000                
CLO par value           95,908,000         95,908,000   79,839,000                
Long-term debt           363,802,000         363,802,000   347,191,000                
Gain (Loss) on Extinguishment of Debt               $ 900,000       $ (1,835,000) [4]                  
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           97,071,000       93,071,000 97,071,000   80,571,000     80,571,000     $ 49,321,000   $ 79,571,000
Interest rate       2.85%                                  
Unamortized debt offering costs           1,163,000         $ 1,163,000   732,000                
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                      
Maturity date                     Dec. 18, 2023                    
Principal amount of borrowings           97,100,000         $ 97,100,000                    
Interest and fees expense           1,200,000 $ 722,000       2,900,000 2,200,000                  
CLO par value           97,100,000         97,100,000                    
Long-term debt           95,908,000         95,908,000   $ 79,839,000                
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Level III                                          
Debt Instrument [Line Items]                                          
Fair value of borrowings           95,900,000         $ 95,900,000                    
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 [5]   Nov. 20, 2029 [6]                
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 [5]   Nov. 20, 2029 [6]                
Long-term debt           $ 11,487,000         $ 11,487,000   $ 11,487,000                
Debt instrument converted amount         25,000,000.0                                
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                    
Interest rate           4.875%         4.875%                    
Debt discount $ 2,430,000         $ 1,819,000         $ 1,819,000   2,157,000                
Debt offering costs 1,200,000                                        
Fair value of outstanding debt           105,300,000         105,300,000                    
Unamortized debt offering costs           880,000         880,000   951,000                
Long-term debt           105,301,000         105,301,000   104,892,000                
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%                    
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                        
Interest expense             $ 0         $ 2,000,000.0                  
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           $ 163,863,000       $ 163,863,000 $ 163,863,000   163,863,000     $ 163,863,000     $ 251,863,000 312,000,000.0  
Debt discount           1,270,000         1,270,000   1,403,000                
Debt Instrument redemption, amount               $ 88,000,000                          
Long-term debt           $ 162,593,000         $ 162,593,000   $ 162,460,000                
Number of coverage tests | CoverageTest                     20                    
2018-2 Subordinated Notes                                          
Debt Instrument [Line Items]                                          
Aggregate principal amount                                       $ 108,000,000.0  
[1] As of June 30, 2022, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facilities of $93,071 and 2018-2 Secured Notes of $163,863.
[2] Total amount of each class of senior securities outstanding at the end of the period presented.
[3] As of March 31, 2022, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facilities of $80,571 and 2018-2 Secured Notes of $163,863.
[4] Refer to Note 9 "Stockholders' Equity" for additional information on changes in components of Stockholders' Equity
[5] 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.
[6] 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.