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Commitments 2 (Details) - GSWC - Water Supply
$ in Thousands
Dec. 31, 2017
USD ($)
Estimated future minimum payments  
2017 $ 400
2018 400
2019 401
2020 400
2021 401
Thereafter 2,792
Total 4,794
City of Claremont [Member]  
Purchase commitments  
Remaining amount of commitment 2,400
Various third parties  
Estimated future minimum payments  
Total $ 2,400