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Cash flow information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Supplemental Cash Flow Information [Abstract]      
Interest, net $ 19,929 $ 21,159  
Income taxes paid (refunded), net 172 (257)  
AFUDC borrowed 1,800 2,700  
Right-of-use assets obtained in exchange for new operating lease liabilities 129 532 $ 1,787
Property, plant and equipment additions in accounts payable $ 23,917 $ 32,309 $ 36,820