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Leases:
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease LEASES
Lessee
We lease from third parties certain office and operation center facilities, communication tower sites, equipment, and materials storage. Our leases have remaining terms ranging from less than 1 year to 35 years, including options to extend that are reasonably certain to be exercised. We have one immaterial finance lease for communication equipment at the WRDC mine.
Most of our leases do not contain a readily determinable discount rate. Therefore, the present value of future lease payments is generally calculated using our applicable subsidiaries’ incremental borrowing rate (weighted-average of 4.24% as of December 31, 2020).
Leases with an initial term of 12 months or less are classified as short-term leases and are not recognized on the accompanying Consolidated Balance Sheets.
Lease expense for the year ended December 31 were as follows (in thousands):
Income Statement Location20202019
Operating lease costOperations and maintenance$978 $1,456 

Supplemental balance sheet information related to leases as of December 31 was as follows (in thousands):
Balance Sheet Location20202019
Assets:
Operating lease assetsOther assets, non-current$4,188 $4,629 
Total lease assets$4,188 $4,629 
Liabilities:
Current:
Operating leasesAccrued liabilities$736 $1,179 
Noncurrent:
Operating leasesOther deferred credits and other liabilities3,807 3,821 
Total lease liabilities$4,543 $5,000 

Supplemental cash flow information related to leases for the year ended December 31 was as follows (in thousands):
20202019
Cash paid included in the measurement of lease liabilities:
Operating cash flows from operating leases$1,023 $1,263 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases$161 $2,801 

Weighted average remaining terms and discount rates related to leases as of December 31 were as follows:
20202019
Weighted average remaining lease term:
Operating leases8 years8 years
Weighted average discount rate:
Operating leases4.24 %4.27 %

As of December 31, 2020, scheduled maturities of lease liabilities for future years were as follows (in thousands):
Operating Leases
2021$907 
2022804 
2023779 
2024776 
2025529 
Thereafter1,643 
Total lease payments$5,438 
Less imputed interest895 
Present value of lease liabilities$4,543 
Lessor

We lease to third parties certain generating station ground leases, communication tower sites, and a natural gas pipeline. These leases have remaining terms ranging from less than one year to 34 years.

Lease revenue for the year ended December 31 were as follows (in thousands):
Income Statement Location20202019
Operating lease incomeRevenue$2,534 $2,306 

As of December 31, 2020, scheduled maturities of operating lease payments to be received in future years were as follows (in thousands):
Operating Leases
2021$2,383 
20222,122 
20232,130 
20242,074 
20252,090 
Thereafter58,829 
Total lease receivables$69,628 
Lease LEASES
Lessee
We lease from third parties certain office and operation center facilities, communication tower sites, equipment, and materials storage. Our leases have remaining terms ranging from less than 1 year to 35 years, including options to extend that are reasonably certain to be exercised. We have one immaterial finance lease for communication equipment at the WRDC mine.
Most of our leases do not contain a readily determinable discount rate. Therefore, the present value of future lease payments is generally calculated using our applicable subsidiaries’ incremental borrowing rate (weighted-average of 4.24% as of December 31, 2020).
Leases with an initial term of 12 months or less are classified as short-term leases and are not recognized on the accompanying Consolidated Balance Sheets.
Lease expense for the year ended December 31 were as follows (in thousands):
Income Statement Location20202019
Operating lease costOperations and maintenance$978 $1,456 

Supplemental balance sheet information related to leases as of December 31 was as follows (in thousands):
Balance Sheet Location20202019
Assets:
Operating lease assetsOther assets, non-current$4,188 $4,629 
Total lease assets$4,188 $4,629 
Liabilities:
Current:
Operating leasesAccrued liabilities$736 $1,179 
Noncurrent:
Operating leasesOther deferred credits and other liabilities3,807 3,821 
Total lease liabilities$4,543 $5,000 

Supplemental cash flow information related to leases for the year ended December 31 was as follows (in thousands):
20202019
Cash paid included in the measurement of lease liabilities:
Operating cash flows from operating leases$1,023 $1,263 
Right-of-use assets obtained in exchange for lease obligations:
Operating leases$161 $2,801 

Weighted average remaining terms and discount rates related to leases as of December 31 were as follows:
20202019
Weighted average remaining lease term:
Operating leases8 years8 years
Weighted average discount rate:
Operating leases4.24 %4.27 %

As of December 31, 2020, scheduled maturities of lease liabilities for future years were as follows (in thousands):
Operating Leases
2021$907 
2022804 
2023779 
2024776 
2025529 
Thereafter1,643 
Total lease payments$5,438 
Less imputed interest895 
Present value of lease liabilities$4,543 
Lessor

We lease to third parties certain generating station ground leases, communication tower sites, and a natural gas pipeline. These leases have remaining terms ranging from less than one year to 34 years.

Lease revenue for the year ended December 31 were as follows (in thousands):
Income Statement Location20202019
Operating lease incomeRevenue$2,534 $2,306 

As of December 31, 2020, scheduled maturities of operating lease payments to be received in future years were as follows (in thousands):
Operating Leases
2021$2,383 
20222,122 
20232,130 
20242,074 
20252,090 
Thereafter58,829 
Total lease receivables$69,628