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Commitments and Contingent Liabilities - Maximum Potential Total of Future Payments Under Commitment Instruments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	$ 291,202
Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	185,302
Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	105,900
Less Than 1  Year
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	289,658
Less Than 1  Year | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	185,302
Less Than 1  Year | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	104,356
1-3 Years
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	1,544
1-3 Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
1-3 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	1,544
3-5 Years
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
3-5 Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
3-5 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Beyond 5  Years
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Beyond 5  Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Beyond 5  Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Firm Transportation | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	178,352
Firm Transportation | Less Than 1  Year | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	178,352
Firm Transportation | 1-3 Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Firm Transportation | 3-5 Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Firm Transportation | Beyond 5  Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Other | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	6,950
Other | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	9,183
Other | Less Than 1  Year | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	6,950
Other | Less Than 1  Year | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	7,899
Other | 1-3 Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Other | 1-3 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	1,284
Other | 3-5 Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Other | 3-5 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Other | Beyond 5  Years | Letters of Credit
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Other | Beyond 5  Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Employee-Related | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	2,600
Employee-Related | Less Than 1  Year | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	2,600
Employee-Related | 1-3 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Employee-Related | 3-5 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Employee-Related | Beyond 5  Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Environmental | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	12,447
Environmental | Less Than 1  Year | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	12,187
Environmental | 1-3 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	260
Environmental | 3-5 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Environmental | Beyond 5  Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Financial Guarantees | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	81,670
Financial Guarantees | Less Than 1  Year | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	81,670
Financial Guarantees | 1-3 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Financial Guarantees | 3-5 Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	0
Financial Guarantees | Beyond 5  Years | Surety Bonds
Loss Contingencies [Line Items]
Maximum potential total of future payments under commitments	$ 0

X

- 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=121555522&loc=d3e12069-110248

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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