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Borrowings - NMFC Credit Facility (Details)
€ in Thousands, £ in Thousands, $ in Thousands
 12 Months Ended
Jun. 29, 2023
Jun. 28, 2023
Jun. 03, 2021
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
EUR (€)
Line of Credit Facility [Line Items]                            
Amortization of financing costs       $ 6,780 $ 6,837 $ 7,388                
NMFC Credit Facility                            
Line of Credit Facility [Line Items]                            
Credit facility outstanding balance       36,813 40,359                  
Revolving Credit Facility | NMFC Credit Facility                            
Line of Credit Facility [Line Items]                            
Credit facility outstanding balance           127,192     £ 22,900 € 700 £ 22,900 € 700 £ 16,400 € 0
Revolving Credit Facility | NMFC Credit Facility | Credit Facility                            
Line of Credit Facility [Line Items]                            
Maximum borrowing capacity       198,500                    
Commitment fee percentage on unused capacity 0.375% 0.375% 0.375%                      
Interest expense       7,380 4,608 3,171                
Non-usage fee       363 247 213                
Amortization of financing costs       $ 216 $ 229 $ 199                
Weighted average interest rate       7.10% 3.50% 2.40%                
Effective interest rate       7.70% 3.80% 2.70%                
Average debt outstanding       $ 103,244 $ 133,053 $ 132,685 $ 155,497 $ 105,533            
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | LIBOR, SONIA or EURIBOR                            
Line of Credit Facility [Line Items]                            
Interest rate margin   2.10% 2.50%                      
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | Prime Rate                            
Line of Credit Facility [Line Items]                            
Interest rate margin 1.10% 1.10% 1.50%                      
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | Secured Overnight Financing Rate (SOFR) Or Sterling Overnight Interbank Average Rate (SONIA) Or Euro Interbank Offered Rate (EURIBOR)                            
Line of Credit Facility [Line Items]                            
Interest rate margin 2.10%