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Commitments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
GSWC | Water Supply  
Estimated future minimum payments  
2021 $ 426
2022 426
2023 426
2024 426
2025 383
Thereafter 1,675
Total 3,762
GSWC | Water Supply | Various third parties  
Purchase commitments  
Remaining amount of commitment 1,900
GSWC | Water Supply | Other various third parties  
Estimated future minimum payments  
Total 1,900
Electric: | Electric Power Purchase Commitments [Member]  
Estimated future minimum payments  
Total $ 20,100