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Debt (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of maturities for long-term debt and finance lease obligations
Maturities for long-term debt and finance lease obligations through 2028 are as follows:
(dollars in thousands)
20242025202620272028
FFB$311,565 $284,714 $265,177 $242,177 $283,089 
FMBs63,510 62,500 62,500 62,500 62,500 
PCRBs— — — — — 
$375,075 $347,214 $327,677 $304,677 $345,589 
Finance Leases9,351 10,413 11,595 12,912 2,153 
Total$384,426 $357,627 $339,272 $317,589 $347,742 
Schedule of long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts at December 31, 2023 and December 31, 2022 are as follows:
20232022
PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts		PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts
(dollars in thousands)
FFB$6,841,352 $51,083 $7,084,148 $52,690 
FMBs4,551,010 60,987 4,152,021 52,480 
PCRBs704,190 8,490 704,190 8,972 
$12,096,552 $120,560 $11,940,359 $114,142