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Property, plant and equipment - Interest and AFUDC Capitalized (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Schedule of Capitalization [Line Items]    
Total $ 12,703 $ 7,350
Non-regulated property    
Schedule of Capitalization [Line Items]    
Interest capitalized on non-regulated property 4,762 3,313
Interest expense    
Schedule of Capitalization [Line Items]    
AFUDC capitalized on regulated property: 6,040 3,208
Interest, dividend and other income    
Schedule of Capitalization [Line Items]    
AFUDC capitalized on regulated property: $ 1,901 $ 829