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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 and 2015:
 
 
For The Three Months Ended September 30,
 
 For The Nine Months Ended 
 September 30,
(dollars in thousands)
 
2016
 
2015
 
2016
 
2015
Fair value at beginning of the period
 
$
(4,933
)
 
$
(5,662
)
 
$
(7,053
)
 
$
(3,339
)
Unrealized gain (loss) on purchased power contracts
 
(648
)
 
(1,584
)
 
1,472

 
(3,907
)
Fair value at end of the period
 
$
(5,581
)
 
$
(7,246
)
 
$
(5,581
)
 
$
(7,246
)