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Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of maturities for long-term debt and finance lease obligations
Maturities for long-term debt and finance lease obligations through 2024 are as follows:
(dollars in thousands)
20202021202220232024
FFB$209,958  $216,652  $221,761  $229,530  $203,452  
FMBs1,010  1,010  1,010  1,010  63,510  
PCBs(1)
—  —  —  —  368,225  
CFC391  —  —  —  —  
$211,359  $217,662  $222,771  $230,540  $635,187  
Finance Leases6,081  6,772  7,541  8,398  9,351  
Total$217,440  $224,434  $230,312  $238,938  $644,538  
(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. 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 and Series 2017 pollution control bonds noted above. As such, December 2024 is the designated maturity date for all of these pollution control bonds totaling $368.2 million. The nominal maturities of the Series 2009 and Series 2010 pollution control bonds range from 2030 through 2038 and the 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, 2019 and December 31, 2018 are as follows:
20192018
PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts		PrincipalUnamortized Debt
Issuance Costs
and
Debt Discounts
(dollars in thousands)
FFB$5,540,215  $60,356  $4,372,422  $50,210  
FMBs3,205,052  39,793  3,556,062  41,509  
PCRBs980,770  11,073  980,770  11,612  
CFC391  —  1,426  —  
$9,726,428  $111,222  $8,910,680  $103,331