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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Golden State Water Company  
Derivative Instruments, Gain (Loss) [Line Items]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following table presents changes in the fair value of GSWC’s Level 3 derivatives for the three and nine months ended September 30, 2018 and 2017:
 
 
For The Three Months Ended September 30,
 
 For The Nine Months Ended 
 September 30,
(dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Fair value at beginning of the period
 
$
(1,710
)
 
$
(4,493
)
 
$
(2,941
)
 
$
(4,901
)
Unrealized gain on purchased power contracts
 
567

 
656

 
1,798

 
1,064

Fair value at end of the period
 
$
(1,143
)
 
$
(3,837
)
 
$
(1,143
)
 
$
(3,837
)