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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2022
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, 2022 and 2021. The change in fair value was due to an increase in energy prices during the three and six months ended June 30, 2022.
 For The Three Months Ended 
 June 30,
 For The Six Months Ended 
 June 30,
(dollars in thousands)2022202120222021
Fair value at beginning of the period$7,020 $1,224 $4,441 $(1,537)
Unrealized gains on purchased power contracts1,094 1,586 3,673 4,347 
Fair value at end of the period$8,114 $2,810 $8,114 $2,810