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Other Commitments and Contingencies Other Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Long-term Purchase Commitment [Line Items]  
Long-term Purchase Commitment [Table Text Block]
The total purchase obligations for natural gas, electric and propane supplies are as follows:
Year20242025-20262027-2028Beyond 2028Total
(in thousands)
Purchase Obligations$86,040 $105,082 $83,851 $141,287 $416,260