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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016:
(dollars in thousands)
 
2017
 
2016
Fair value at beginning of the period
 
$
(4,901
)
 
$
(7,053
)
Unrealized loss on purchased power contracts
 
(559
)
 
(192
)
Fair value at end of the period
 
$
(5,460
)
 
$
(7,245
)