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Related party transactions - Related party transactions with affiliated company - Equity Method - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Equity investment	$ 234,512		$ 236,485
Return of capital from equity method investments	$ 279	$ 249
BHD LEON
Related Party Transaction [Line Items]
Ownership interest	15.84%
BHD LEON \| Cash Distribution
Related Party Transaction [Line Items]
Investment Dividends or distribution	$ 19,400	14,100
BHD LEON \| Stock Distribution
Related Party Transaction [Line Items]
Investment Dividends or distribution	2,900	2,100
BHD LEON
Related Party Transaction [Line Items]
Equity investment	223,900		$ 225,900
Losses (earnings) from investments in equity method investees	$ 17,400	$ 32,300