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Commitments and Contingent Liabilities - Amount of Commitment Expiration Per Period (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	$ 293,778
Less Than 1  Year
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	233,549
1-3 Years
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	60,229
3-5 Years
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Beyond 5  Years
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | Firm Transportation
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	181,575
Letters of Credit | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	7,021
Letters of Credit | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	188,596
Letters of Credit | Less Than 1  Year | Firm Transportation
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	181,575
Letters of Credit | Less Than 1  Year | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	7,021
Letters of Credit | Less Than 1  Year | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	188,596
Letters of Credit | 1-3 Years | Firm Transportation
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | 1-3 Years | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | 1-3 Years | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | 3-5 Years | Firm Transportation
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | 3-5 Years | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | 3-5 Years | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | Beyond 5  Years | Firm Transportation
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | Beyond 5  Years | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Letters of Credit | Beyond 5  Years | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	8,897
Surety Bond | Employee-Related
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	2,600
Surety Bond | Environmental
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	12,015
Surety Bond | Financial Guarantees
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	81,670
Surety Bond | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	105,182
Surety Bond | Less Than 1  Year | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	8,283
Surety Bond | Less Than 1  Year | Employee-Related
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | Less Than 1  Year | Environmental
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	10,270
Surety Bond | Less Than 1  Year | Financial Guarantees
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	26,400
Surety Bond | Less Than 1  Year | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	44,953
Surety Bond | 1-3 Years | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	614
Surety Bond | 1-3 Years | Employee-Related
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	2,600
Surety Bond | 1-3 Years | Environmental
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	1,745
Surety Bond | 1-3 Years | Financial Guarantees
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	55,270
Surety Bond | 1-3 Years | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	60,229
Surety Bond | 3-5 Years | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | 3-5 Years | Employee-Related
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | 3-5 Years | Environmental
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | 3-5 Years | Financial Guarantees
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | 3-5 Years | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | Beyond 5  Years | Other
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | Beyond 5  Years | Employee-Related
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | Beyond 5  Years | Environmental
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | Beyond 5  Years | Financial Guarantees
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond | Beyond 5  Years | Loss Contingencies by Secondary Nature of Contingency
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	$ 0

X

- Definition

Schedule of Costs Related to Purchase Obligations [Line Items]

+ References

No definition available.

+ Details

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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