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Leases (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Trust
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 1986
Trust
Estimated future minimum lease payments for operating leases, excluding purchased power agreements        
Lease expense $ 16,000 $ 17,000 $ 18,000  
Pinnacle West        
Estimated future minimum lease payments for operating leases, excluding purchased power agreements        
2017 12,330      
2018 10,987      
2019 9,019      
2020 7,688      
2021 5,266      
Thereafter 59,647      
Total future lease commitments 104,937      
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        
2017 11,919      
2018 10,690      
2019 8,767      
2020 7,439      
2021 5,020      
Thereafter 57,207      
Total future lease commitments 101,042      
Lease expense $ 15,000 $ 14,000 $ 15,000  
Number of VIE lessor trusts | Trust 3     3