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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | $ 167,467 | $ 171,772 | $ 284,877 | $ 306,026 |  |  |
Regulatory balancing account revenue | 11,564 | 3,166 | 20,265 | 3,465 |  |  |
Total operating revenue | 179,031 | 174,938 | $ 305,142 | 309,491 |  |  |
Maximum collection period in which deferred net WRAM and MCBA revenues and associated costs will be recognized |  |  | 24 months |  |  |  |
Total non-regulated revenue | $ 5,130 | 4,845 | $ 10,031 | 9,264 |  |  |
Lessor operating lease renewal term | 15 years |  | 15 years |  |  |  |
2019 | $ 3,095 |  | $ 3,095 |  |  |  |
2020 | 2,499 |  | 2,499 |  |  |  |
2021 | 1,827 |  | 1,827 |  |  |  |
2022 | 1,031 |  | 1,031 |  |  |  |
2023 | 554 |  | 554 |  |  |  |
Thereafter | 872 |  | 872 |  |  |  |
Cash and cash equivalents | 54,560 |  | 54,560 |  |  | $ 47,176 |
Restricted cash (included in taxes, prepaid expenses and other assets) | 520 |  | 520 |  |  | 539 |
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows | 55,080 | 34,265 | 55,080 | 34,265 |  | $ 47,715 | $ 95,352
Other assets | 14,241 |  | 14,241 |  |  |  |
Operating lease liability | $ 14,206 |  | $ 14,206 |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating lease liability |  |  |  |  | $ 13,800 |  |
Minimum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lessor operating lease term | 5 years |  | 5 years |  |  |  |
Maximum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lessor operating lease term | 10 years |  | 10 years |  |  |  |
Regulated water and wastewater services |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | $ 167,467 | 171,772 | $ 284,877 | 306,026 |  |  |
Total operating revenue | 179,031 | 174,938 | 305,142 | 309,491 |  |  |
Operating and maintenance revenue |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 3,273 | 2,297 | 6,319 | 5,462 |  |  |
Other non-regulated revenue |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 1,267 | 1,981 | 2,563 | 2,724 |  |  |
Non-regulated revenue |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 4,540 | 4,278 | 8,882 | 8,186 |  |  |
Lease revenue | 590 | 567 | 1,149 | 1,078 |  |  |
Total non-regulated revenue | 5,130 | 4,845 | 10,031 | 9,264 |  |  |
Residential |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 107,349 | 109,849 | 191,609 | 201,167 |  |  |
Business |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 31,706 | 32,125 | 57,186 | 59,182 |  |  |
Industrial |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 7,524 | 7,941 | 14,788 | 15,520 |  |  |
Public authorities |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | 7,613 | 8,251 | 12,084 | 13,695 |  |  |
Other (a) |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers |  |  | $ 9,210 | $ 16,462 |  |  |
Other | $ 13,275 | $ 13,606 |  |  |  |  |

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