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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | $ 117,410 | $ 134,254 |  |  |
Regulatory balancing account revenue | 8,701 | 299 |  |  |
Total operating revenue | $ 126,111 | 134,553 |  |  |
Maximum collection period in which deferred net WRAM and MCBA revenues and associated costs will be recognized | 24 months |  |  |  |
Total non-regulated revenue | $ 4,901 | 4,419 |  |  |
Lessor operating lease renewal term | 15 years |  |  |  |
2019 | $ 3,032 |  |  | $ 1,771 |
2020 | 2,482 |  |  | 1,709 |
2021 | 1,809 |  |  | 1,485 |
2022 | 1,013 |  |  | 1,355 |
2023 | 534 |  |  | 1,261 |
Thereafter | 828 |  |  | 10,538 |
Cash and cash equivalents | 60,234 |  |  | 47,176 |
Restricted cash (included in taxes, prepaid expenses and other assets) | 656 |  |  | 539 |
Total cash, cash equivalents, and restricted cash shown in the statements of cash flows | 60,890 | 35,333 |  | $ 47,715 | $ 95,352
Other assets | 14,128 |  |  |  |
Operating lease liability | $ 14,112 |  |  |  |
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 |  |  |  |
Maximum |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Lessor operating lease term | 10 years |  |  |  |
Regulated water and wastewater services |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | $ 117,410 | 134,254 |  |  |
Total operating revenue | 126,111 | 134,553 |  |  |
Operating and maintenance revenue |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | 3,046 | 3,165 |  |  |
Other non-regulated revenue |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | 1,296 | 743 |  |  |
Non-regulated revenue |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | 4,342 | 3,908 |  |  |
Lease revenue | 559 | 511 |  |  |
Total non-regulated revenue | 4,901 | 4,419 |  |  |
Residential |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | 84,259 | 91,319 |  |  |
Business |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | 25,481 | 27,057 |  |  |
Industrial |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | 7,264 | 7,579 |  |  |
Public authorities |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from contracts with customers | 4,471 | 5,444 |  |  |
Other (a) |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Other | $ (4,065) | $ 2,855 |  |  |

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