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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments
The following table presents changes in the fair value of the Level 3 derivatives for the three and six months ended June 30, 2023 and 2022. The change in fair value was due to the change in market energy prices during the three and six months ended June 30, 2023 and 2022.
 For The Three Months Ended 
 June 30,
 For The Six Months Ended 
 June 30,
(dollars in thousands)2023202220232022
Fair value at beginning of the period$6,669 $7,020 $11,847 $4,441 
Unrealized (losses) gains on purchased power contracts(2,012)1,094 (7,190)3,673 
Fair value at end of the period$4,657 $8,114 $4,657 $8,114