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Derivatives (Net Derivatives As Reflected On The Balance Sheets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Net derivatives as classified in the balance sheet $ (3,280) $ 3,901
Heating oil and coal | Other current assets    
Derivatives, Fair Value [Line Items]    
Net derivatives as classified in the balance sheet 11,435 4,214
Coal Contract | Accrued expenses and other current liabilities    
Derivatives, Fair Value [Line Items]    
Net derivatives as classified in the balance sheet $ (14,715) $ (313)