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Other Commitments and Contingencies Other Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
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
 
2019
 
2020-2021
 
2022-2023
 
Beyond 2023
 
Total
(in thousands)
 
 
 
 
 
 
 
 
 
 
Purchase Obligations
 
$
158,544

 
$
74,970

 
$
42,279

 
$
129,019

 
$
404,812