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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of maturities for long-term debt and finance lease obligations
Maturities for long-term debt and finance lease obligations through 2025 are as follows:
(dollars in thousands)
20212022202320242025
FFB$200,867 $275,553 $247,601 $222,273 $229,168 
FMBs1,010 1,010 1,010 63,510 62,500 
PCBs(1)
— — 122,620 245,605 — 
$201,877 $276,563 $371,231 $531,388 $291,668 
Finance Leases6,772 7,541 8,398 9,351 10,413 
Total$208,649 $284,104 $379,629 $540,739 $302,081 
(1)In addition to regularly scheduled principal payments included are amounts that would be due at the later of (i) maturity date of the credit support facilities backing the Series 2009 and Series 2010 pollution control bonds, or at the mandatory redemption date of the Series 2017A and Series 2017B pollution control bonds or (ii) at the maturity of an alternative back-up credit facility we currently have available to refinance draws on the credit facilities or provide alternate credit support for these bonds. We currently maintain a $1.21 billion syndicated bank credit facility with a maturity date of December 2024 which backs the Series 2010 pollution control bonds and would be available as an alternative back-up credit facility for the Series 2009 pollution control bonds noted above. As such, December 2024 is the designated maturity date for the Series 2009 and Series 2010 pollution control bonds totaling $245.6 million. The Series 2017 bonds totaling $122.6 million have a mandatory redemption in 2023 if the bonds are not remarketed before then, and as such, October 2023 is the designated maturity date for the Series 2017 bonds. The nominal maturities of the Series 2017 pollution control bonds range from 2040 to 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, 2020 and December 31, 2019 are as follows:
20202019
PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts		PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts
(dollars in thousands)
FFB$5,985,015 $57,971 $5,540,215 $60,356 
FMBs3,654,041 49,134 3,205,052 39,793 
PCRBs980,770 12,460 980,770 11,073 
CFC— — 391 — 
$10,619,826 $119,565 $9,726,428 $111,222