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Derivative Instruments (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016:
 
 
For The Three Months Ended June 30,
 
 For The Six Months Ended 
 June 30,
(dollars in thousands)
 
2017
 
2016
 
2017
 
2016
Fair value at beginning of the period
 
$
(5,460
)
 
$
(7,245
)
 
$
(4,901
)
 
$
(7,053
)
Unrealized gain on purchased power contracts
 
967

 
2,312

 
408

 
2,120

Fair value at end of the period
 
$
(4,493
)
 
$
(4,933
)
 
$
(4,493
)
 
$
(4,933
)