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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, 2023 | Dec. 31, 2022
Estimated Refunds of Advances for Construction [Abstract] |  |
2024 | $ 3,034 |
2025 | 2,970 |
2026 | 2,878 |
2027 | 2,793 |
2028 | 2,726 |
Thereafter | 46,574 |
Advances for construction | 146,582 | $ 137,696
Customer advances for construction, non-refundable | 55,170 |
Customer advances for construction, refunded on service connections | $ 30,437 |
Contract with customer, refund period | 40 years |
Contract with customer, fair value of advances | $ 40,915 | $ 44,715
Amortization period for taxes paid relating to advances and contributions | 40 years |

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