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Palo Verde Sale Leaseback Variable Interest Entities - Schedule of VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Palo Verde Sale Leaseback Variable Interest Entities    
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation $ 14,919,565 $ 14,522,538
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets    
Equity — Noncontrolling interests 125,789 122,540
APS    
Palo Verde Sale Leaseback Variable Interest Entities    
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 14,919,195 14,522,156
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets    
Equity — Noncontrolling interests 125,789 122,540
Palo Verde VIE    
Palo Verde Sale Leaseback Variable Interest Entities    
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 99,003 101,906
Palo Verde VIE | APS    
Palo Verde Sale Leaseback Variable Interest Entities    
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 99,003 101,906
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets    
Equity — Noncontrolling interests $ 125,789 $ 122,540