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Other Commitments and Contingencies Other Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2019
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:
Year
 
2020
 
2021-2022
 
2023-2024
 
Beyond 2024
 
Total
(in thousands)
 
 
 
 
 
 
 
 
 
 
Purchase Obligations
 
$
60,735

 
$
72,123

 
$
60,049

 
$
201,131

 
$
394,038