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Leases (Tables) | 3 Months Ended
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Mar. 31, 2019
Leases [Abstract] |
Lease cost | The following tables provide other additional information related to operating lease liabilities:
| March 31, 2019
Weighted average remaining lease term | 8 years |
Weighted average discount rate | 3.86 | %
| Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows (dollars in thousands): | $ | 3,087 |
The following table provides information related to our lease costs for the three months ended March 31, 2019 (dollars in thousands):
|  | Three Months Ended March 31, 2019
|  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
Operating lease cost |  | $ | — |  |  | $ | 4,348 |  |  | $ | 4,348 |
Variable lease cost |  | 17,290 |  |  | — |  |  | 17,290 |
Total lease cost |  | $ | 17,290 |  |  | $ | 4,348 |  |  | $ | 21,638 |
Schedule of future minimum payments | The following table provides information related to the maturity of our operating lease liabilities at March 31, 2019 (dollars in thousands):
|  | March 31, 2019
Year |  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
2019 (remaining nine months of 2019) |  | $ | 54,499 |  |  | $ | 10,539 |  |  | $ | 65,038 |
2020 |  | — |  |  | 12,424 |  |  | 12,424 |
2021 |  | — |  |  | 9,585 |  |  | 9,585 |
2022 |  | — |  |  | 6,621 |  |  | 6,621 |
2023 |  | — |  |  | 5,496 |  |  | 5,496 |
Thereafter |  | — |  |  | 41,618 |  |  | 41,618 |
Total lease commitments |  | 54,499 |  |  | 86,283 |  |  | 140,782 |
Less imputed interest |  | 814 |  |  | 20,829 |  |  | 21,643 |
Total lease liabilities |  | $ | 53,685 |  |  | $ | 65,454 |  |  | $ | 119,139 |
The following table provides information related to estimated future minimum operating lease payments at December 31, 2018 (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 |

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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 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=77888426&loc=SL77918701-209980 + Details
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