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Revenues - Cabot Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Cabot Receivable $ 8,958 $ 9,773
Accounts Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Cabot Receivable 2,146 921
Other Noncurrent Assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Cabot Receivable $ 6,812 $ 8,852