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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Operating revenues | $ 740,530 | $ 692,714
Regulatory cost recovery revenue | 20,000 | 10,000
Electric Service | Retail residential electric service |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 351,566 | 316,675
Electric Service | Retail non-residential electric service |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 332,668 | 343,189
Electric Service | Wholesale energy sales |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 36,452 | 12,089
Transmission Services For Others |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 15,249 | 14,845
Other sources |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 4,595 | 5,916
Electric and Transmission Service |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | $ 721,000 | $ 683,000

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