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Leases (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Trust | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 1986 Trust
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
Lease expense | $ 18,000 | $ 16,000 | $ 17,000 |
Pinnacle West |  |  |  |
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
2018 | 13,412 |  |  |
2019 | 11,054 |  |  |
2020 | 9,641 |  |  |
2021 | 7,105 |  |  |
2022 | 4,609 |  |  |
Thereafter | 55,940 |  |  |
Total future lease commitments | 101,761 |  |  |
Palo Verde Lessor Trusts |  |  |  |
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
Number of VIE lessor trusts | Trust |  |  |  | 3
APS |  |  |  |
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
2018 | 13,110 |  |  |
2019 | 10,802 |  |  |
2020 | 9,392 |  |  |
2021 | 6,858 |  |  |
2022 | 4,510 |  |  |
Thereafter | 53,605 |  |  |
Total future lease commitments | 98,277 |  |  |
Lease expense | $ 17,000 | $ 15,000 | $ 14,000 |
Number of VIE lessor trusts | Trust | 3 |  |  | 3

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