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Leases (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Trust
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 1986
Trust
Estimated future minimum lease payments for operating leases, excluding purchased power agreements        
Lease expense $ 17,000 $ 18,000 $ 18,000  
Pinnacle West        
Estimated future minimum lease payments for operating leases, excluding purchased power agreements        
2016 9,182      
2017 8,557      
2018 7,045      
2019 6,121      
2020 4,835      
Thereafter 61,251      
Total future lease commitments 96,991      
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        
2016 8,797      
2017 8,317      
2018 6,880      
2019 5,961      
2020 4,680      
Thereafter 61,101      
Total future lease commitments 95,736      
Lease expense $ 14,000 $ 15,000 $ 15,000  
Number of VIE lessor trusts | Trust 3     3