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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2017 and 2016:
 
 
For The Three Months Ended September 30,
 
 For The Nine Months Ended 
 September 30,
(dollars in thousands)
 
2017
 
2016
 
2017
 
2016
Fair value at beginning of the period
 
$
(4,493
)
 
$
(4,933
)
 
$
(4,901
)
 
$
(7,053
)
Unrealized gain (loss) on purchased power contracts
 
656

 
(648
)
 
1,064

 
1,472

Fair value at end of the period
 
$
(3,837
)
 
$
(5,581
)
 
$
(3,837
)
 
$
(5,581
)