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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2020
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 the Level 3 derivatives for the three and six months ended June 30, 2020 and 2019:
 
 
For The Three Months Ended June 30,
 
For The Six Months Ended June 30,
(dollars in thousands)
 
2020
 
2019
 
2020
 
2019
Fair value at beginning of the period
 
$
(4,280
)
 
$
(336
)
 
$
(3,171
)
 
$
(311
)
Unrealized gains (losses) on purchased power contracts
 
453

 
69

 
(656
)
 
44

Fair value at end of the period
 
$
(3,827
)
 
$
(267
)
 
$
(3,827
)
 
$
(267
)