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Segment information - Segment capital spending (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Capital spending $ 130,506 $ 116,860 $ 130,713
Operating segments | Florida business segment      
Disclosure of operating segments [line items]      
Capital spending 70,445 74,458 85,725
Operating segments | Mid-Atlantic business segment      
Disclosure of operating segments [line items]      
Capital spending 58,819 41,970 40,683
Operating segments | STET segment      
Disclosure of operating segments [line items]      
Capital spending 59 83 72
Unallocated corporate      
Disclosure of operating segments [line items]      
Capital spending $ 1,183 $ 349 $ 4,233