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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | $ 214,963 | $ 209,541 | $ 499,840 | $ 515,567 |  |  |
Total operating revenue | 232,537 | 221,288 | $ 537,679 | 530,779 |  |  |
Maximum collection period |  |  | 24 months |  |  |  |
Total non-regulated revenue | $ 4,118 | 4,703 | $ 14,149 | 13,967 |  |  |
Lessee options to extend the lease | 15 years |  | 15 years |  |  |  |
2019 | $ 3,153 |  | $ 3,153 |  |  |  |
2020 | 2,587 |  | 2,587 |  |  |  |
2021 | 1,880 |  | 1,880 |  |  |  |
2022 | 1,078 |  | 1,078 |  |  |  |
2023 | 584 |  | 584 |  |  |  |
Thereafter | 871 |  | 871 |  |  |  |
Cash and cash equivalents | 51,257 |  | 51,257 |  |  | $ 47,176 |
Restricted cash (included in taxes, prepaid expenses and other assets) | 566 |  | 566 |  |  | 539 |
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows | 51,823 | 67,092 | 51,823 | 67,092 |  | $ 47,715 | $ 95,352
Operating lease liability | $ 14,306 |  | $ 14,306 |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating lease liability |  |  |  |  | $ 13,800 |  |
Minimum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating lease term | 5 years |  | 5 years |  |  |  |
Maximum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating lease term | 10 years |  | 10 years |  |  |  |
Regulated water and wastewater services |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | $ 214,963 | 209,541 | $ 499,840 | 515,567 |  |  |
Regulatory balancing account revenue | 17,574 | 11,747 | 37,839 | 15,212 |  |  |
Total operating revenue | 232,537 | 221,288 | 537,679 | 530,779 |  |  |
Residential |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 139,137 | 138,939 | 330,745 | 340,107 |  |  |
Business |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 38,247 | 38,538 | 95,433 | 97,720 |  |  |
Industrial |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 9,077 | 8,987 | 23,866 | 24,507 |  |  |
Public authorities |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 12,482 | 12,180 | 24,566 | 25,875 |  |  |
Other |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 16,020 | 10,897 | 25,230 | 27,358 |  |  |
Operating and maintenance revenue |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 2,929 | 2,816 | 9,248 | 8,278 |  |  |
Other non-regulated revenue |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 626 | 1,328 | 3,189 | 4,053 |  |  |
Non-regulated revenue |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 3,555 | 4,144 | 12,437 | 12,331 |  |  |
Lease revenue | 563 | 559 | 1,712 | 1,636 |  |  |
Total non-regulated revenue | $ 4,118 | $ 4,703 | $ 14,149 | $ 13,967 |  |  |

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