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Borrowings - NMFC Credit Facility (Details)
€ in Thousands, £ in Thousands, $ in Thousands
 12 Months Ended
Jun. 04, 2021
Jun. 03, 2021
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
GBP (£)
Line of Credit Facility [Line Items]                    
Amortization of financing costs     $ 6,837 $ 7,388 $ 4,935          
Revolving Credit Facility | NMFC Credit Facility                    
Line of Credit Facility [Line Items]                    
Credit facility outstanding balance     40,359 127,192 165,500     £ 22,900 € 700 £ 16,400
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%                
Interest expense     4,608 3,171 5,023          
Non-usage fee     247 213 126          
Amortization of financing costs     $ 229 $ 199 $ 137          
Weighted average interest rate     3.50% 2.40% 3.20%          
Effective interest rate     3.80% 2.70% 3.40%          
Average debt outstanding     $ 133,053 $ 132,685 $ 155,497 $ 105,533 $ 117,719      
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | LIBOR, SONIA or EURIBOR                    
Line of Credit Facility [Line Items]                    
Interest rate margin 2.10%                  
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | Prime Rate                    
Line of Credit Facility [Line Items]                    
Interest rate margin 1.10% 1.50%                
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | LIBOR                    
Line of Credit Facility [Line Items]                    
Interest rate margin   2.50%