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Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of maturities for long-term debt and finance lease obligations Maturities for long-term debt and finance lease obligations through 2026 are as follows:
(dollars in thousands)
20222023202420252026
FFB$272,686 $270,127 $288,031 $254,368 $234,028 
FMBs1,010 1,010 63,510 62,500 62,500 
PCBs(1)
— 122,620 — — — 
$273,696 $393,757 $351,541 $316,868 $296,528 
Finance Leases7,541 8,398 9,351 10,413 11,595 
Total$281,237 $402,155 $360,892 $327,281 $308,123 
(1)In addition to regularly scheduled principal payments, included are amounts that would be due at the mandatory redemption date of the Series 2017A and Series 2017B pollution control bonds. These Series 2017 bonds, totaling $122.6 million, have a mandatory redemption in 2023 if the bonds are not remarketed before then, with nominal maturities in 2040 and 2045.
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, 2021 and December 31, 2020 are as follows:
20212020
PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts		PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts
(dollars in thousands)
FFB$6,526,858 $55,159 $5,985,015 $57,971 
FMBs3,653,031 46,985 3,654,041 49,134 
PCRBs735,165 9,765 980,770 12,460 
$10,915,054 $111,909 $10,619,826 $119,565