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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 and 2018:
 
 
For The Three Months Ended September 30,
 
For The Nine Months Ended September 30,
(dollars in thousands)
 
2019
 
2018
 
2019
 
2018
Fair value at beginning of the period
 
$
(267
)
 
$
(1,710
)
 
$
(311
)
 
$
(2,941
)
Unrealized gain (loss) on purchased power contracts
 
(2,755
)
 
567

 
(2,711
)
 
1,798

Fair value at end of the period
 
$
(3,022
)
 
$
(1,143
)
 
$
(3,022
)
 
$
(1,143
)