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Derivatives - Net derivatives as reflected on the balance sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Net derivatives as classified in the balance sheet $ 2,707 $ 3,901
Other current assets    
Derivatives, Fair Value [Line Items]    
Current asset representing cash collateral posted   2,800
Heating oil and coal | Other current assets    
Derivatives, Fair Value [Line Items]    
Net derivatives as classified in the balance sheet $ 2,707 4,214
Coal Contract | Accrued expenses and other current liabilities    
Derivatives, Fair Value [Line Items]    
Net derivatives as classified in the balance sheet   $ (313)