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Commitments (Tables)
12 Months Ended
Dec. 31, 2020
Risks and Uncertainties [Abstract]  
Schedule of estimated future minimum payments under purchased water supply commitments
GSWC’s estimated future minimum payments under these purchased water supply commitments at December 31, 2020 are as follows (in thousands):
2021$426 
2022426 
2023426 
2024426 
2025383 
Thereafter1,675 
Total$3,762