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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 238,352 | $ 222,474 | $ 597,337 | $ 529,804
Total operating revenue | 256,723 | 304,108 | 617,583 | 605,155
Total non-regulated revenue | 5,813 | 3,934 | 16,759 | 11,969
Regulated Water and WasteWater Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 238,352 | 222,474 | 597,337 | 529,804
Regulatory balancing account revenue | 18,371 | 81,634 | 20,246 | 75,351
Total operating revenue | 256,723 | 304,108 | 617,583 | 605,155
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 164,311 | 151,938 | 400,653 | 360,935
Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 43,450 | 36,951 | 106,902 | 93,175
Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 7,347 | 7,496 | 19,409 | 21,996
Public authorities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 14,126 | 12,862 | 30,886 | 26,470
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9,118 | 13,227 | 39,487 | 27,228
Operating and maintenance revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 4,110 | 2,680 | 12,122 | 7,969
Other non-regulated revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 894 | 625 | 2,550 | 2,223
Non-Regulated Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 5,004 | 3,305 | 14,672 | 10,192
Lease revenue | 809 | 629 | 2,087 | 1,777
Total non-regulated revenue | $ 5,813 | $ 3,934 | $ 16,759 | $ 11,969

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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=124258985&loc=SL77919372-209981 + Details
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