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Retirement Plans and Other Benefits - Impact to Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits    
Details related to accumulated other comprehensive loss    
Net actuarial loss $ 794,292 $ 643,199
Prior service credit 0 0
APS’s portion recorded as a regulatory (asset) liability (733,351) (576,188)
Income tax expense (benefit) (15,083) (24,915)
Accumulated other comprehensive loss 45,858 42,096
Estimated amounts that will be amortized from accumulated other comprehensive loss and regulatory assets into net periodic benefit cost in 2014    
Net actuarial loss 43,248  
Prior service credit 0  
Total amounts estimated to be amortized from accumulated other comprehensive loss (gain) and regulatory assets (liabilities) in 2019 43,248  
Other Benefits    
Details related to accumulated other comprehensive loss    
Net actuarial loss 63,544 75,439
Prior service credit (227,733) (265,575)
APS’s portion recorded as a regulatory (asset) liability 163,767 189,627
Income tax expense (benefit) 561 853
Accumulated other comprehensive loss 139 $ 344
Estimated amounts that will be amortized from accumulated other comprehensive loss and regulatory assets into net periodic benefit cost in 2014    
Net actuarial loss 0  
Prior service credit (37,821)  
Total amounts estimated to be amortized from accumulated other comprehensive loss (gain) and regulatory assets (liabilities) in 2019 $ (37,821)