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Leases (Tables) | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Estimated future minimum lease payments for Pinnacle West's and APS's operating leases, excluding purchased power agreements | Estimated future minimum lease payments for Pinnacle West’s and APS’s operating leases, excluding purchased power agreements, are approximately as follows (dollars in thousands):
Year |  | Pinnacle West Consolidated |  | APS
2019 |  | $ | 13,747 |  |  | $ | 13,411 |
2020 |  | 12,428 |  |  | 12,143 |
2021 |  | 9,478 |  |  | 9,282 |
2022 |  | 6,513 |  |  | 6,321 |
2023 |  | 5,359 |  |  | 5,171 |
Thereafter |  | 42,236 |  |  | 40,656 |
Total future lease commitments |  | $ | 89,761 |  |  | $ | 86,984 |

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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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