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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2019 and 2018:
 
 
For The Three Months Ended March 31,
(dollars in thousands)
 
2019
 
2018
Fair value at beginning of the period
 
$
(311
)
 
$
(2,941
)
Unrealized gain (loss) on purchased power contracts
 
(25
)
 
316

Fair value at end of the period
 
$
(336
)
 
$
(2,625
)