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Borrowings - NMFC Credit Facility (Details) € in Thousands, £ in Thousands, $ in Thousands		12 Months Ended					15 Months Ended	25 Months Ended
	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 29, 2024	Jun. 28, 2023	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 GBP (£)
Line of Credit Facility [Line Items]
Amortization of financing costs		$ 9,797	$ 6,780	$ 6,837
NMFC Credit Facility
Line of Credit Facility [Line Items]
Credit facility outstanding balance											$ 27,944			$ 36,813
Revolving Credit Facility | NMFC Credit Facility
Line of Credit Facility [Line Items]
Credit facility outstanding balance									€ 16,512	£ 8,700		€ 700	£ 22,900		€ 700	£ 22,900	$ 40,359	€ 0	£ 16,400
Revolving Credit Facility | NMFC Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 638,500
Commitment fee percentage on unused capacity	0.375%						0.375%	0.375%
Interest expense		5,174	7,380	4,608
Non-usage fee		900	363	247
Amortization of financing costs		$ 348	$ 216	$ 229
Weighted average interest rate		7.00%	7.10%	3.50%
Effective interest rate		8.70%	7.70%	3.80%
Average debt outstanding		$ 74,245	$ 103,244	$ 133,053	$ 132,685	$ 155,497
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | SOFR , 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%	1.10%
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 | Extending Lenders
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 527,100
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | Extending Lenders | SOFR , SONIA or EURIBOR
Line of Credit Facility [Line Items]
Interest rate margin	1.90%
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | Non-Extending Lenders
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 111,400
Revolving Credit Facility | NMFC Credit Facility | Credit Facility | Non-Extending Lenders | SOFR , SONIA or EURIBOR
Line of Credit Facility [Line Items]
Interest rate margin	2.10%

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Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of the fee for available but unused credit capacity under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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