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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2024
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 months ended March 31, 2024 and 2023. The change in fair value was due to the change in market energy prices during the three months ended March 31, 2024 and 2023.
 For The Three Months Ended 
 March 31,
(dollars in thousands)20242023
Fair value at beginning of the period$(2,360)$11,847 
Unrealized (losses) gains on purchase power contracts
(3,808)(5,178)
Fair value at end of the period$(6,168)$6,669