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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Schedule of balance sheet impact of leases
For lease agreements entered into or reassessed after the adoption of the new leases standard, we combine lease and nonlease components.

Classification20202019
(dollars in thousands)
Right-of-Use Assets - Finance leases
   Right-of-use assets$302,732 $302,732 
   Less: Accumulated provision for depreciation(262,774)(257,504)
      Total finance lease assets$39,958 $45,228 
Lease liabilities - Finance leases
   Obligations under finance leases$68,876 $75,649 
   Long-term debt and finance leases due within one year6,773 6,081 
      Total finance lease liabilities$75,649 $81,730 

Classification20202019
(dollars in thousands)
Right-of-Use Assets - Operating leases
   Electric plant in service$3,283 $3,237 
      Total operating lease assets$3,283 $3,237 
Lease liabilities - Operating leases
   Capitalization - Other$2,388 $2,293 
   Other current liabilities990 1,252 
      Total operating lease liabilities$3,378 $3,545 
Schedule of lease cost
20202019
(dollars in thousands)
Lease CostClassification
Finance lease cost:
   Amortization of leased assetsDepreciation and amortization$5,376 $4,756 
   Interest on lease liabilitiesInterest expense$8,868 $9,488 
Operating lease costInventory(1) & production expense$1,305 $3,179 
      Total lease cost$15,549 $17,423 

(1)The majority of our operating lease costs relate to our railcar leases and such costs are added to the cost of our fossil-fuel inventories and are recognized in fuel expense as the inventories are consumed.
Summary of lease terms and discount rates
December 31, 2020December 31, 2019
Lease Term and Discount Rate
Weighted-average remaining lease term (in years):
   Finance leases7.868.84
   Operating leases7.277.39
Weighted-average discount rate:
   Finance leases11.05 %11.05 %
   Operating leases4.63 %5.12 %
Schedule of cash paid for amounts included in the measurement of lease liabilities
20202019
(dollars in thousands)
Other Information:
Cash paid for amounts included in the measurement of lease liabilities
   Operating cash flows from finance leases$8,868 $9,488 
   Operating cash flows from operating leases$1,540 $3,710 
   Financing cash flows from finance leases$6,082 $5,461 
Right-of-use assets obtained in exchange for new operating lease liabilities$1,227 $6,983 
Schedule of maturities of finance and operating lease liabilities Maturity analysis of our finance and operating lease liabilities as of December 31, 2020 is as follows:
(dollars in thousands)
Year Ending December 31,Finance LeasesOperating LeasesTotal
2021$14,949 $1,119 $16,068 
202214,949 929 15,878 
202314,949 708 15,657 
202414,949 234 15,183 
202514,949 72 15,021 
Thereafter40,583 1,012 41,595 
   Total lease payments$115,328 $4,074 $119,402 
   Less: imputed interest(39,679)(696)(40,375)
Present value of lease liabilities$75,649 $3,378 $79,027 
Schedule of lessor's income from leases
Lease income recognized during 2020 and 2019 was as follows:

20202019
Lease income$6,171 $6,071