Agreements and transactions with related parties (Details) - USD ($) $ in Thousands		3 Months Ended
	Jul. 15, 2022	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related-party transactions
Amount unpaid		$ 6,650		$ 7,038
Investment in unconsolidated joint ventures (including $7,169 and $7,360 held at fair value)		$ 132,730		$ 133,321
Management agreement
Related-party transactions
Automatically renewal period		1 year
Minimum notice period for termination		180 days
Termination fee multiplier		3
Period immediately preceding the termination used as basis for determination of the termination fee due		24 months
Management agreement | Minimum
Related-party transactions
Independent director votes required for approval		66.70%
Related Party | Manager | Management fee
Related-party transactions
Fee percentage for results up to threshold		1.50%
Fee threshold		$ 500,000
Fee percentage for results in excess of threshold		1.00%
Fees		$ 6,600	$ 5,100
Amount unpaid		$ 6,600	5,100
Related Party | Manager | Incentive distribution
Related-party transactions
Incentive distribution paid			1,700
Amount unpaid			1,700
Incentive multiplier		15.00%
Core earnings period		12 months
Percentage of Incentive fee multiplied by the weighted average of issue price		8.00%
The period over which core earnings must exceed the minimum threshold per the terms of the agreement		48 months
Minimum core earnings threshold		$ 0
Related Party | Manager | Expense reimbursement
Related-party transactions
Reimbursable expenses		2,800	2,900
Amount unpaid		1,200	$ 1,800
Related Party | Waterfall Atlas Fund, LP
Related-party transactions
Commitment to invest into a parallel vehicle	$ 125,000
Distributions due as a percentage of carried interest distributions received by the General Partner	15.00%
Incremental percentage by which the entity's internal rate of return is to exceed the investment internal rate of return	1.50%
Cash contributions		61,200
Amount of investment contributions committed but not yet funded		$ 63,800