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