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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | $ 869,501 | $ 974,123 | $ 1,610,031 | $ 1,666,837
Regulatory cost recovery revenue | 12,000 | 20,000 | 32,000 | 27,000
Electric Service | Retail residential electric service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 432,568 | 500,247 | 784,134 | 816,922
Electric Service | Retail non-residential electric service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 395,929 | 435,500 | 728,597 | 778,689
Electric Service | Wholesale energy sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 21,991 | 15,392 | 58,443 | 27,481
Transmission Services For Others |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 15,157 | 15,489 | 30,406 | 30,334
Other sources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 3,856 | 7,495 | 8,451 | 13,411
Electric and Transmission Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | $ 858,000 | $ 954,000 | $ 1,578,000 | $ 1,640,000

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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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