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Summary of Significant Accounting Policies - Advances for Construction and Contributions in Aid of Construction (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Estimated Refunds of Advances for Construction [Abstract] |  |
2022 | $ 3,609 |
2023 | 3,548 |
2024 | 3,282 |
2025 | 3,030 |
2026 | 2,809 |
Thereafter | 49,582 |
Advances for construction | 130,693 | $ 125,027
Customer advances for construction, non-refundable | 36,388 |
Customer advances for construction, refunded on service connections | $ 28,445 |
Contract with customer, refund period | 40 years |
Contract with customer, fair value of advances | $ 51,067 | $ 50,391
Amortization period for taxes paid relating to advances and contributions | 40 years |

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