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Derivative Instruments (Tables) (GOLDEN STATE WATER COMPANY)
 3 Months Ended
Mar. 31, 2015
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, 2015 and 2014:
(dollars in thousands)
 
2015
 
2014
Fair value at beginning of the period
 
$
(3,339
)
 
$
—

Unrealized loss on purchased power contracts
 
(2,837
)
 
—

Fair value at end of the period
 
$
(6,176
)
 
$
—