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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Instruments
The financial instruments measured at fair value on a recurring basis are summarized below:
Fair Value Measurements atFair Value Measurements at
June 30, 2025December 31, 2024
DescriptionLevel 1Level 2Level 3Level 1Level 2Level 3
U.S. Treasury Securities$— $— $— $51,993 $— $— 
Global Water Treatment Trust Fund(1)
$12,466 $— $— $12,054 $— $— 
(1) The Global Water Treatment Trust Fund is included in Funds for Asset Retirement Obligations in the accompanying Consolidated Balance Sheets.
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The carrying amounts and fair values of financial instruments for which the fair value option was not elected are as follows:
June 30, 2025December 31, 2024
Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
Long-Term Debt (Excluding Debt Issuance Costs)$365,769 $370,976 $184,677 $199,052