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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2024 and 2023. The change in fair value was due to the change in market energy prices during the three and six months ended June 30, 2024 and 2023.
 For The Three Months Ended 
 June 30,		 For The Six Months Ended 
 June 30,
(dollars in thousands)2024202320242023
Fair value at beginning of the period$(6,168)$6,669 $(2,360)$11,847 
Unrealized gains (losses) on purchase power contracts
575 (2,012)(3,233)(7,190)
Fair value at end of the period$(5,593)$4,657 $(5,593)$4,657