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Leases (Tables) | 9 Months Ended
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Sep. 30, 2020
Leases [Abstract] |
Lease cost | The following tables provide information related to our lease costs (dollars in thousands):
|  | Three Months Ended September 30, 2020 |  | Three Months Ended September 30, 2019
|  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total |  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
Operating lease cost |  | $ | 51,662 |  |  | $ | 4,655 |  |  | $ | 56,317 |  |  | $ | 21,095 |  |  | $ | 4,581 |  |  | $ | 25,676 |
Variable lease cost |  | 40,658 |  |  | 232 |  |  | 40,890 |  |  | 36,917 |  |  | 183 |  |  | 37,100 |
Short-term lease cost |  | — |  |  | 1,038 |  |  | 1,038 |  |  | — |  |  | 812 |  |  | 812 |
Total lease cost |  | $ | 92,320 |  |  | $ | 5,925 |  |  | $ | 98,245 |  |  | $ | 58,012 |  |  | $ | 5,576 |  |  | $ | 63,588 |
|  | Nine Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2019
|  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total |  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
Operating lease cost |  | $ | 68,883 |  |  | $ | 13,959 |  |  | $ | 82,842 |  |  | $ | 35,159 |  |  | $ | 13,343 |  |  | $ | 48,502 |
Variable lease cost |  | 102,052 |  |  | 730 |  |  | 102,782 |  |  | 95,736 |  |  | 543 |  |  | 96,279 |
Short-term lease cost |  | — |  |  | 2,824 |  |  | 2,824 |  |  | — |  |  | 3,477 |  |  | 3,477 |
Total lease cost |  | $ | 170,935 |  |  | $ | 17,513 |  |  | $ | 188,448 |  |  | $ | 130,895 |  |  | $ | 17,363 |  |  | $ | 148,258 |
Schedule of future minimum payments | The following table provides information related to the maturity of our operating lease liabilities (dollars in thousands):
|  | September 30, 2020
Year |  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
2020 (remaining three months of 2020) |  | $ | 14,889 |  |  | $ | 3,294 |  |  | $ | 18,183 |
2021 |  | 66,658 |  |  | 13,402 |  |  | 80,060 |
2022 |  | 68,325 |  |  | 9,781 |  |  | 78,106 |
2023 |  | 70,033 |  |  | 7,443 |  |  | 77,476 |
2024 |  | 71,784 |  |  | 5,162 |  |  | 76,946 |
2025 |  | 73,578 |  |  | 3,457 |  |  | 77,035 |
Thereafter |  | 36,759 |  |  | 36,961 |  |  | 73,720 |
Total lease commitments |  | 402,026 |  |  | 79,500 |  |  | 481,526 |
Less imputed interest |  | 15,565 |  |  | 18,407 |  |  | 33,972 |
Total lease liabilities |  | $ | 386,461 |  |  | $ | 61,093 |  |  | $ | 447,554 |
The following tables provide other additional information related to operating lease liabilities (dollars in thousands):
| Nine Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows: | $ | 56,896 |  |  | $ | 51,980 |
Right-of-use operating lease assets obtained in exchange for operating lease liabilities | 436,587 |  |  | 8,759 |
| September 30, 2020 |  | December 31, 2019
Weighted average remaining lease term | 7 years |  | 13 years
Weighted average discount rate (a) | 1.69 | % |  | 3.71 | %
(a) Most of our lease agreements do not contain an implicit rate that is readily determinable. For these agreements we use our incremental borrowing rate to measure the present value of lease liabilities. We determine our incremental borrowing rate at lease commencement based on the rate of interest that we would have to pay to borrow, on a collateralized basis over a similar term, an amount equal to the lease payments in a similar economic environment. We use the implicit rate when it is readily determinable.

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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