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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2022
GSWC  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative Instruments The following table presents changes in the fair value of the Level 3 derivatives for the three months ended March 31, 2022 and 2021. The changes in fair value during the three months ended March 31, 2022 and 2021were due to an increase in energy prices.
 For The Three Months Ended 
 March 31,
(dollars in thousands)20222021
Fair value at beginning of the period$4,441 $(1,537)
Unrealized gains on purchased power contracts2,579 2,761 
Fair value at end of the period$7,020 $1,224