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Acquisition of Marshall Mine - Allocation (Details) - Marshall Mine - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Assets acquired:    
Receivables $ 0 $ 513
Property, plant and equipment 3,863 3,863
Spare parts 100 100
Liabilities assumed:    
Accounts payable and accrued expenses (673) (513)
Asset retirement obligation (21,328) (21,328)
Net assets acquired and liabilities assumed from Marshall Mine acquisition (18,038) (17,365)
Cabot Receivable 9,749 9,749
Upfront Customer Consideration $ 8,289 7,616
Adjustments    
Receivables   513
Property, plant and equipment   0
Spare parts   0
Accounts payable and accrued expenses   160
Asset retirement obligation   0
Net assets acquired and liabilities assumed from Marshall Mine acquisition   673
Cabot Receivable   0
Upfront Customer Consideration   $ (673)