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Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 222,474 | $ 214,963 | $ 529,804 | $ 499,840
Total operating revenue | 304,108 | 232,537 | 605,155 | 537,679
Total non-regulated revenue | 3,934 | 4,118 | 11,969 | 14,149
Regulated Water and WasteWater Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 222,474 | 214,963 | 529,804 | 499,840
Regulatory balancing account revenue | 81,634 | 17,574 | 75,351 | 37,839
Total operating revenue | 304,108 | 232,537 | 605,155 | 537,679
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 151,938 | 139,137 | 360,935 | 330,745
Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 36,951 | 38,247 | 93,175 | 95,433
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 7,496 | 9,077 | 21,996 | 23,866
Public authorities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 12,862 | 12,482 | 26,470 | 24,566
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 13,227 | 16,020 | 27,228 | 25,230
Operating and maintenance revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,680 | 2,929 | 7,969 | 9,248
Other non-regulated revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 625 | 626 | 2,223 | 3,189
Non-Regulated Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 3,305 | 3,555 | 10,192 | 12,437
Lease Income | 629 | 563 | 1,777 | 1,712
Total non-regulated revenue | $ 3,934 | $ 4,118 | $ 11,969 | $ 14,149

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- Definition Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919372-209981 + Details
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