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Other Commitments and Contingencies Other Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2020
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:
Year20212022-20232024-2025Beyond 2025Total
(in thousands)
Purchase Obligations$69,459 $81,841 $69,420 $201,504 $422,224