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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Operating revenues | $ 974,123 | $ 1,666,837
Regulatory cost recovery revenue | 20,000 | 27,000
Electric Service | Retail residential electric service |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 500,247 | 816,922
Electric Service | Retail non-residential electric service |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 435,500 | 778,689
Electric Service | Wholesale energy sales |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 15,392 | 27,481
Transmission Services For Others |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 15,489 | 30,334
Other sources |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 7,495 | 13,411
Electric and Transmission Service |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | $ 954,000 | $ 1,640,000

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