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Leases (Tables)
 12 Months Ended
Dec. 31, 2022
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.
Classification20222021
(dollars in thousands)
Right-of-use assets - Finance leases
   Right-of-use assets$302,732 $302,732 
   Less: Accumulated provision for depreciation(272,876)(267,606)
      Total finance lease assets$29,856 $35,126 
Lease liabilities - Finance leases
   Obligations under finance leases$52,937 $61,335 
   Long-term debt and finance leases due within one year8,398 7,541 
      Total finance lease liabilities$61,335 $68,876 
Classification20222021
(dollars in thousands)
Right-of-use assets - Operating leases
   Electric plant in service, net$3,326 $2,293 
      Total operating lease assets$3,326 $2,293 
Lease liabilities - Operating leases
   Capitalization - Other$2,256 $1,550 
   Other current liabilities1,164 838 
      Total operating lease liabilities$3,420 $2,388 
Schedule of lease cost
20222021
(dollars in thousands)
Lease CostClassification
Finance lease cost:
   Amortization of leased assetsDepreciation and amortization$7,542 $6,420 
   Interest on lease liabilitiesInterest expense$7,408 $8,177 
Operating lease costInventory(1) & production expense$995 $1,079 
      Total lease cost$15,945 $15,676 

(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, 2022December 31, 2021
Lease Term and Discount Rate
Weighted-average remaining lease term (in years):
   Finance leases5.946.90
   Operating leases6.448.01
Weighted-average discount rate:
   Finance leases11.05 %11.05 %
   Operating leases5.52 %4.73 %
Schedule of cash paid for amounts included in the measurement of lease liabilities
20222021
(dollars in thousands)
Other Information:
Cash paid for amounts included in the measurement of lease liabilities
   Operating cash flows from finance leases$7,408 $8,177 
   Operating cash flows from operating leases$1,009 $1,129 
   Financing cash flows from finance leases$7,541 $6,772 
Right-of-use assets obtained in exchange for new operating lease liabilities$1,954 $— 
Schedule of maturities of finance operating lease liabilities Maturity analysis of our finance and operating lease liabilities as of December 31, 2022 is as follows:
(dollars in thousands)
Year Ending December 31,Finance LeasesOperating LeasesTotal
2023$14,949 $1,324 $16,273 
202414,949 850 15,799 
202514,949 641 15,590 
202614,949 350 15,299 
202714,949 72 15,021 
Thereafter10,683 868 11,551 
   Total lease payments$85,428 $4,105 $89,533 
   Less: imputed interest(24,093)(685)(24,778)
Present value of lease liabilities$61,335 $3,420 $64,755 
Schedule of maturities of operating lease liabilities Maturity analysis of our finance and operating lease liabilities as of December 31, 2022 is as follows:
(dollars in thousands)
Year Ending December 31,Finance LeasesOperating LeasesTotal
2023$14,949 $1,324 $16,273 
202414,949 850 15,799 
202514,949 641 15,590 
202614,949 350 15,299 
202714,949 72 15,021 
Thereafter10,683 868 11,551 
   Total lease payments$85,428 $4,105 $89,533 
   Less: imputed interest(24,093)(685)(24,778)
Present value of lease liabilities$61,335 $3,420 $64,755 
Schedule of lessor's income from leases
Lease income recognized during 2022 and 2021 was as follows:
20222021
Lease income$6,539$6,312