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Debt (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Schedule of maturities for long-term debt and finance lease obligations Maturities for long-term debt and finance lease obligations through 2027 are as follows:
(dollars in thousands)
20232024202520262027
FFB$312,695 $308,892 $282,399 $262,793 $271,623 
FMBs1,010 63,510 62,500 62,500 62,500 
PCRBs— — — — — 
$313,705 $372,402 $344,899 $325,293 $334,123 
Finance Leases8,398 9,351 10,413 11,595 12,912 
Total$322,103 $381,753 $355,312 $336,888 $347,035 
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, 2022 and December 31, 2021 are as follows:
20222021
PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts		PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts
(dollars in thousands)
FFB$7,084,148 $52,690 $6,526,858 $55,159 
FMBs4,152,021 52,480 3,653,031 46,985 
PCRBs704,190 8,972 735,165 9,765 
$11,940,359 $114,142 $10,915,054 $111,909