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Commitments and Contingent Liabilities - Maximum Potential Total of Future Payments Under Commitment Instruments (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments $ 265,121
Letters of Credit:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 43,684
Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 221,437
Less Than 1  Year  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 265,121
Less Than 1  Year | Letters of Credit:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 43,684
Less Than 1  Year | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 221,437
1-3 Years  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 0
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 0
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 40,331
Firm Transportation | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 126,336
Firm Transportation | Less Than 1  Year | Letters of Credit:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 40,331
Firm Transportation | Less Than 1  Year | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 126,336
Firm Transportation | 1-3 Years | Letters of Credit:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 0
Firm Transportation | 1-3 Years | Surety Bonds:  
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 | 3-5 Years | Surety Bonds:  
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
Firm Transportation | Beyond 5  Years | Surety Bonds:  
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 3,353
Other | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 8,682
Other | Less Than 1  Year | Letters of Credit:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 3,353
Other | Less Than 1  Year | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 8,682
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 0
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 2,250
Employee-Related | Less Than 1  Year | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 2,250
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 11,449
Environmental | Less Than 1  Year | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 11,449
Environmental | 1-3 Years | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 0
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 72,720
Financial Guarantees | Less Than 1  Year | Surety Bonds:  
Loss Contingencies [Line Items]  
Maximum potential total of future payments under commitments 72,720
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