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Maximum Potential Total of Future Payments Under Commitment Instruments (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | $ 311,013
Letters of Credit: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 204,726
Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 106,287
Less Than 1 Year |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 259,469
Less Than 1 Year | Letters of Credit: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 154,726
Less Than 1 Year | Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 104,743
1-3 Years |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 51,544
1-3 Years | Letters of Credit: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 50,000
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 | 197,776
Firm Transportation | Less Than 1 Year | Letters of Credit: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 148,526
Firm Transportation | 1-3 Years | Letters of Credit: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 49,250
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 | 9,254
Other | Less Than 1 Year | Letters of Credit: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 6,200
Other | Less Than 1 Year | Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 7,970
Other | 1-3 Years | Letters of Credit: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 750
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 | 12,763
Environmental | Less Than 1 Year | Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 12,503
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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