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Commitments and Contingent Liabilities - Maximum Potential Total of Future Payments Under Commitment Instruments (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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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

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