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Revenues - Cabot Receivables (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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

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- Definition Amount due from parties in nontrade transactions, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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