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Revenue (Tables)
 6 Months Ended
Jun. 30, 2021
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue [Table Text Block] The following table presents our revenue from contracts with customers and other revenue (in thousands):
For the Three Months EndedFor the Three Months Ended
June 30, 2021June 30, 2020
Retail Revenues
     Retail revenue from contracts with customers:
          Residential$129,254 $127,752 
          Small commercial and industrial48,208 43,402 
          Large commercial and industrial127,009 119,302 
          Public lighting2,270 2,309 
          Other (1)
4,175 2,805 
                    Total retail revenue from contracts with customers310,916 295,570 
     Alternative revenue programs11,710 8,789 
Wholesale Revenues
     Wholesale revenues from contracts with customers:4,918 4,501 
Miscellaneous Revenues
     Transmission and other revenue from contracts with customers2,692 2,329 
     Other miscellaneous revenues (2)
351 314 
Total Revenues$330,587 $311,503 
(1)Other retail revenue from contracts with customers includes miscellaneous charges to customers
(2)Other miscellaneous revenue includes lease and other miscellaneous revenues not accounted for under ASC 606