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Leases (Tables) | 12 Months Ended
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Dec. 31, 2019
Leases [Abstract] |
Lease cost | The following table provides information related to our lease costs (dollars in thousands):
|  | Year Ended December 31, 2019
|  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
Operating lease cost |  | $ | 42,190 |  |  | $ | 18,038 |  |  | $ | 60,228 |
Variable lease cost |  | 113,233 |  |  | 782 |  |  | 114,015 |
Short-term lease cost |  | — |  |  | 4,385 |  |  | 4,385 |
Total lease cost |  | $ | 155,423 |  |  | $ | 23,205 |  |  | $ | 178,628 |
The following tables provide other additional information related to operating lease liabilities:
| December 31, 2019
Weighted average remaining lease term | 13 years |
Weighted average discount rate (a) | 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.
| Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows (dollars in thousands): | $ | 69,075 |
Schedule of future minimum payments | The following table provides information related to estimated future minimum operating lease payments (dollars in thousands):
|  | December 31, 2018
Year |  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
2019 |  | $ | 54,499 |  |  | $ | 13,747 |  |  | $ | 68,246 |
2020 |  | — |  |  | 12,428 |  |  | 12,428 |
2021 |  | — |  |  | 9,478 |  |  | 9,478 |
2022 |  | — |  |  | 6,513 |  |  | 6,513 |
2023 |  | — |  |  | 5,359 |  |  | 5,359 |
Thereafter |  | — |  |  | 42,236 |  |  | 42,236 |
Total future lease commitments |  | $ | 54,499 |  |  | $ | 89,761 |  |  | $ | 144,260 |
Maturity of our operating lease liabilities | The following table provides information related to the maturity of our operating lease liabilities (dollars in thousands):
|  | December 31, 2019
Year |  | Purchased Power Lease Contracts (a) |  | Land, Property & Equipment Leases |  | Total
2020 |  | $ | — |  |  | $ | 14,698 |  |  | $ | 14,698 |
2021 |  | — |  |  | 11,963 |  |  | 11,963 |
2022 |  | — |  |  | 8,331 |  |  | 8,331 |
2023 |  | — |  |  | 6,326 |  |  | 6,326 |
2024 |  | — |  |  | 4,141 |  |  | 4,141 |
Thereafter |  | — |  |  | 38,697 |  |  | 38,697 |
Total lease commitments |  | — |  |  | 84,156 |  |  | 84,156 |
Less imputed interest |  | — |  |  | 19,571 |  |  | 19,571 |
Total lease liabilities |  | $ | — |  |  | $ | 64,585 |  |  | $ | 64,585 |
(a) As of December 31, 2019, we had no operating lease liabilities relating to purchased power lease contracts. See discussion below regarding executed contracts with commencement dates beginning in June 2020.

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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=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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