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Leases (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Trust | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 1986 Trust
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
Lease expense | $ 18,000 | $ 18,000 | $ 16,000 |
Future minimum payments due | 54,000 |  |  |
Operating lease, cost | 47,000 | 60,000 | 82,000 |
Contingent rents | 109,000 | 100,000 | 88,000 |
Pinnacle West |  |  |  |
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
2019 | 13,747 |  |  |
2020 | 12,428 |  |  |
2021 | 9,478 |  |  |
2022 | 6,513 |  |  |
2023 | 5,359 |  |  |
Thereafter | 42,236 |  |  |
Total future lease commitments | 89,761 |  |  |
Palo Verde Lessor Trusts |  |  |  |
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
Number of VIE lessor trusts | Trust |  |  |  | 3
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |
Estimated future minimum lease payments for operating leases, excluding purchased power agreements |  |  |  |
2019 | 13,411 |  |  |
2020 | 12,143 |  |  |
2021 | 9,282 |  |  |
2022 | 6,321 |  |  |
2023 | 5,171 |  |  |
Thereafter | 40,656 |  |  |
Total future lease commitments | 86,984 |  |  |
Lease expense | $ 17,000 | $ 17,000 | $ 15,000 |
Number of VIE lessor trusts | Trust | 3 |  |  | 3

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