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Fair Value Measurements - Significant unobservable inputs and fair value of debt if carried at fair value (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value Measurements        
Total unobservable inputs $ 2,260,816 $ 2,245,025 $ 2,135,954 $ 2,133,381
Level 2        
Fair Value Measurements        
Fair value of debt not carried at fair value 1,409,565 1,281,276    
Level 2 | 2019-1 Notes        
Fair Value Measurements        
Fair value of debt not carried at fair value 339,837 330,634    
Level 2 | March 2026 Notes        
Fair Value Measurements        
Fair value of debt not carried at fair value 266,260 259,769    
Level 2 | October 2026 Notes        
Fair Value Measurements        
Fair value of debt not carried at fair value 257,468 247,873    
Level 3        
Fair Value Measurements        
Fair value of assets 2,172,803 2,118,974    
Total unobservable inputs 2,260,816 2,245,025    
Unobservable inputs not developed 88,013 126,051    
Level 3 | Sumitomo Credit Facility        
Fair Value Measurements        
Fair value of debt not carried at fair value 546,000 443,000    
First Lien Senior Secured Loans        
Fair Value Measurements        
Total unobservable inputs 1,474,596 1,554,258 1,530,721 1,674,890
First Lien Senior Secured Loans one | Discounted cash flows | Comparative Yields | Level 3        
Fair Value Measurements        
Fair value of assets $ 1,196,348 $ 1,196,770    
First Lien Senior Secured Loans one | Discounted cash flows | Comparative Yields | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 5.9 5.9    
First Lien Senior Secured Loans one | Discounted cash flows | Comparative Yields | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 26.8 20.4    
First Lien Senior Secured Loans one | Discounted cash flows | Comparative Yields | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 12 11.6    
First Lien Senior Secured Loans two | Comparable company multiple | EBITDA Multiple | Level 3        
Fair Value Measurements        
Fair value of assets $ 112,938 $ 139,041    
First Lien Senior Secured Loans two | Comparable company multiple | EBITDA Multiple | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 0.5 2    
First Lien Senior Secured Loans two | Comparable company multiple | EBITDA Multiple | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 10.1 11.8    
First Lien Senior Secured Loans two | Comparable company multiple | EBITDA Multiple | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 8.3 8.6    
First Lien Senior Secured Loans three | Comparable company multiple | EBITDA Multiple | Level 3        
Fair Value Measurements        
Fair value of assets $ 74,181 $ 73,070    
Investment Owned, Measurement Input 8.2 8.3    
First Lien Senior Secured Loans three | Comparable company multiple | Probability weighting of alternative outcomes | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 25 25    
First Lien Senior Secured Loans three | Comparable company multiple | Probability weighting of alternative outcomes | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 75 75    
First Lien Senior Secured Loans four | Discounted cash flows | Discount Rate | Level 3        
Fair Value Measurements        
Fair value of assets $ 8,761 $ 19,484    
First Lien Senior Secured Loans four | Discounted cash flows | Discount Rate | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input   10    
First Lien Senior Secured Loans four | Discounted cash flows | Discount Rate | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 15.2 14.8    
First Lien Senior Secured Loans four | Discounted cash flows | Discount Rate | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input   13.2    
First Lien Senior Secured Loans five | Collateral | Recovery Rate | Level 3        
Fair Value Measurements        
Fair value of assets $ 11,553 $ 8,429    
Investment Owned, Measurement Input 100 100    
Equity Interests        
Fair Value Measurements        
Total unobservable inputs $ 229,737 $ 210,689 216,020 151,844
Equity Interest one | Discounted cash flows | Discount Rate | Level 3        
Fair Value Measurements        
Fair value of assets $ 135,738 $ 128,923    
Equity Interest one | Discounted cash flows | Discount Rate | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 13.4 10    
Equity Interest one | Discounted cash flows | Discount Rate | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 16.4 16.4    
Equity Interest one | Discounted cash flows | Discount Rate | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 15.4 15.2    
Equity Interest two | Comparable company multiple | EBITDA Multiple | Level 3        
Fair Value Measurements        
Fair value of assets $ 68,937 $ 65,472    
Equity Interest two | Comparable company multiple | EBITDA Multiple | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 1.7 2    
Equity Interest two | Comparable company multiple | EBITDA Multiple | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 24.8 22.8    
Equity Interest two | Comparable company multiple | EBITDA Multiple | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 11.7 8.6    
Equity Interest three | Comparable company multiple | EBITDA Multiple | Level 3        
Fair Value Measurements        
Fair value of assets $ 13,039 $ 13,033    
Investment Owned, Measurement Input 8.2 8.3    
Equity Interest three | Comparable company multiple | Probability weighting of alternative outcomes | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 25 25    
Equity Interest three | Comparable company multiple | Probability weighting of alternative outcomes | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 75 75    
Subordinated Notes in Investment Vehicles        
Fair Value Measurements        
Total unobservable inputs $ 302,974 $ 237,974 178,137 125,437
Subordinated Notes in Investment Vehicles | Collateral | Recovery Rate | Level 3        
Fair Value Measurements        
Fair value of assets $ 302,974 $ 237,974    
Investment Owned, Measurement Input 100 100    
Second Lien Senior Secured Loans        
Fair Value Measurements        
Total unobservable inputs $ 85,797 $ 93,950 95,340 107,066
Second Lien Senior Secured Loans | Discounted cash flows | Comparative Yields | Level 3        
Fair Value Measurements        
Fair value of assets $ 85,797 $ 93,950    
Second Lien Senior Secured Loans | Discounted cash flows | Comparative Yields | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 13.8 12.7    
Second Lien Senior Secured Loans | Discounted cash flows | Comparative Yields | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 23.9 21.8    
Second Lien Senior Secured Loans | Discounted cash flows | Comparative Yields | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 15.7 (15.7)    
Preferred Equity        
Fair Value Measurements        
Total unobservable inputs $ 99,650 $ 80,945 75,950 53,991
Preferred Equity | Discounted cash flows | Comparative Yields | Level 3        
Fair Value Measurements        
Fair value of assets $ 5,002      
Investment Owned, Measurement Input 11.5      
Preferred Equity | Comparable company multiple | EBITDA Multiple | Level 3        
Fair Value Measurements        
Fair value of assets $ 89,473 $ 75,619    
Preferred Equity | Comparable company multiple | EBITDA Multiple | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 1.7 2    
Preferred Equity | Comparable company multiple | EBITDA Multiple | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 15.3 23    
Preferred Equity | Comparable company multiple | EBITDA Multiple | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 7.1 7.2    
Subordinated Debt        
Fair Value Measurements        
Total unobservable inputs $ 44,446 $ 43,922 39,280 20,027
Subordinated Debt | Discounted cash flows | Comparative Yields | Level 3        
Fair Value Measurements        
Fair value of assets $ 44,446 $ 43,922    
Subordinated Debt | Discounted cash flows | Comparative Yields | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 12.1 11.9    
Subordinated Debt | Discounted cash flows | Comparative Yields | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 13.3 13.5    
Subordinated Debt | Discounted cash flows | Comparative Yields | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 12.2 12    
Structured Products        
Fair Value Measurements        
Total unobservable inputs $ 23,159 $ 22,763    
Structured Products | Discounted cash flows | Comparative Yields | Level 3        
Fair Value Measurements        
Fair value of assets $ 23,159 $ 22,763    
Investment Owned, Measurement Input 14.6 15    
Warrants        
Fair Value Measurements        
Total unobservable inputs $ 457 $ 524 $ 506 $ 126
Warrants | Comparable company multiple | EBITDA Multiple | Level 3        
Fair Value Measurements        
Fair value of assets $ 457 $ 524    
Warrants | Comparable company multiple | EBITDA Multiple | Minimum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 7.8 7.5    
Warrants | Comparable company multiple | EBITDA Multiple | Maximum | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 10.3 11.8    
Warrants | Comparable company multiple | EBITDA Multiple | Weighted average | Level 3        
Fair Value Measurements        
Investment Owned, Measurement Input 10.3 8.9