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Commitments (Tables)
12 Months Ended
Dec. 31, 2014
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, 2014 are as follows (in thousands):
 
2015
$
447

2016
319

2017
319

2018
319

2019
319

Thereafter
3,541

Total
$
5,264

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, 2014 are as follows (in thousands):
 
2015
$
2,345

2016
2,130

2017
1,895

2018
1,508

2019
1,232

Thereafter
1,904

Total
$
11,014