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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

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+ 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

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