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Revenue - Sources of Revenue (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |
Total operating revenues | $ 3,691,247
Retail residential electric service | Retail residential |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 1,867,370
Retail residential electric service | Retail non-residential |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 1,628,891
Retail residential electric service | Wholesale |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 109,198
Transmission services for others |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 60,261
Other sources |
Disaggregation of Revenue [Line Items] |
Total operating revenues | $ 25,527

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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