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Derivative Instruments (Tables)
9 Months Ended
Sep. 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 nine months ended September 30, 2023 and 2022. The change in fair value was due to the change in market energy prices during the three and nine months ended September 30, 2023 and 2022.
 For The Three Months Ended 
 September 30,
 For The Nine Months Ended 
 September 30,
(dollars in thousands)2023202220232022
Fair value at beginning of the period$4,657 $8,114 $11,847 $4,441 
Unrealized (losses) gains on purchase power contracts
(3,132)(545)(10,322)3,128 
Fair value at end of the period$1,525 $7,569 $1,525 $7,569