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Commitments (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018 are as follows (in thousands):
2019
$
407

2020
407

2021
407

2022
407

2023
407

Thereafter
2,410

Total
$
4,445

Schedule of future minimum payments under long-term non-cancelable operating leases
Registrant’s future minimum payments under long-term non-cancelable operating leases at December 31, 2018 are as follows (in thousands):
2019
$
2,818

2020
2,530

2021
1,497

2022
1,007

2023
546

Thereafter
605

Total
$
9,003