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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Operating revenues | $ 661,930 | $ 740,530
Regulatory cost recovery revenue | 14,000 | 20,000
Electric Service | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 325,073 | 351,566
Electric Service | Non-Residential |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 303,351 | 332,668
Electric Service | Wholesale energy sales |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 14,668 | 36,452
Transmission services for others |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 15,927 | 15,249
Other sources |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 2,911 | 4,595
Electric and Transmission Service |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | $ 648,000 | $ 721,000

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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