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Summary of significant accounting policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended		60 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 17, 2024
Investments in and Advances to Affiliates, Activity [Line Items]
Cash and cash equivalents	$ 57,832	$ 118,662
Cash equivalents	$ 56,000	$ 118,000
8.25% Series A Cumulative Redeemable Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Preferred stock dividend percentage	8.25%	8.25%
Liquidation preference (in dollars per share)	$ 25.00
8.00% Series B Cumulative Redeemable Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Preferred stock dividend percentage	8.00%	8.00%
Liquidation preference (in dollars per share)	$ 25.00
8.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Investments in and Advances to Affiliates, Activity [Line Items]
Preferred stock dividend percentage	8.00%	8.00%	8.00%
Liquidation preference (in dollars per share)	$ 25.00		$ 25.00
Preferred units, liquidation spread, percent			0.26161%
Basis spread percentage			6.476%

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