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Acquisition of Marshall Mine (Tables)
9 Months Ended
Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]  
Summary of Purchase Consideration and Allocation A summary of the net assets acquired and liabilities assumed and the additional assets recorded in the Marshall Mine Purchase Agreement as of the Acquisition Date are shown in the table below. The Company completed additional analysis of the assets acquired and liabilities assumed and recorded adjustments as of December 31, 2020 as shown in the table below.
(in thousands)As Originally ReportedAdjustmentsAs Adjusted
Assets acquired:
Receivables$— $513 $513 
Property, plant and equipment3,863 — 3,863 
Spare parts100 — 100 
Liabilities assumed:
Accounts payable and accrued expenses(673)160 (513)
Asset retirement obligation(21,328)— (21,328)
Net assets acquired and liabilities assumed from Marshall Mine acquisition(18,038)673 (17,365)
Cabot Receivable9,749 — 9,749 
Upfront Customer Consideration$8,289 $(673)$7,616