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Changes in Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of changes in accumulated other comprehensive loss including reclassification adjustments, net of tax, by component
The following table shows the changes in Pinnacle West's consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component for the three and six months ended June 30, 2018 and 2017 (dollars in thousands):
 
 Pension and Other Postretirement Benefits



 Derivative Instruments



 Total
Three Months Ended June 30
 
 
 
 
 
 
 
 
 
Balance March 31, 2018
$
(49,494
)



$
(2,847
)



$
(52,341
)
OCI (loss) before reclassifications
(5,928
)



—




(5,928
)
Amounts reclassified from accumulated other comprehensive loss
1,189


 (a)

456


(b)

1,645

Balance June 30, 2018
$
(54,233
)



$
(2,391
)



$
(56,624
)










Balance March 31, 2017
$
(38,548
)



$
(4,315
)



$
(42,863
)
OCI (loss) before reclassifications
(2,157
)



7




(2,150
)
Amounts reclassified from accumulated other comprehensive loss
823


 (a)

564


(b)

1,387

Balance June 30, 2017
$
(39,882
)



$
(3,744
)



$
(43,626
)

 
 Pension and Other Postretirement Benefits



 Derivative Instruments



 Total
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
Balance December 31, 2017
$
(42,440
)



$
(2,562
)



$
(45,002
)
OCI (loss) before reclassifications
(5,928
)



(96
)



(6,024
)
Amounts reclassified from accumulated other comprehensive loss
2,089


 (a)

865


(b)

2,954

Reclassification of income tax effect related to tax reform
(7,954
)



(598
)



(8,552
)
Balance June 30, 2018
$
(54,233
)



$
(2,391
)



$
(56,624
)










Balance December 31, 2016
$
(39,070
)



$
(4,752
)



$
(43,822
)
OCI (loss) before reclassifications
(2,157
)



(763
)



(2,920
)
Amounts reclassified from accumulated other comprehensive loss
1,345


 (a)

1,771


(b)

3,116

Balance June 30, 2017
$
(39,882
)



$
(3,744
)



$
(43,626
)


(a)
These amounts primarily represent amortization of actuarial loss, and are included in the computation of net periodic pension cost.  See Note 5.
(b)
These amounts represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA.  See Note 7.
APS  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of changes in accumulated other comprehensive loss including reclassification adjustments, net of tax, by component
The following table shows the changes in APS's consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component for the three and six months ended June 30, 2018 and 2017 (dollars in thousands): 
 
 Pension and Other Postretirement Benefits



 Derivative Instruments



 Total
Three Months Ended June 30
 
 
 
 
 
 
 
 
 
Balance March 31, 2018
$
(28,004
)



$
(2,847
)



$
(30,851
)
OCI (loss) before reclassifications
(5,790
)



—




(5,790
)
Amounts reclassified from accumulated other comprehensive loss
1,026


 (a)

456


 (b)

1,482

Balance June 30, 2018
$
(32,768
)



$
(2,391
)



$
(35,159
)










Balance March 31, 2017
$
(20,060
)



$
(4,315
)



$
(24,375
)
OCI (loss) before reclassifications
(2,121
)



7




(2,114
)
Amounts reclassified from accumulated other comprehensive loss
813


 (a)

564


 (b)

1,377

Balance June 30, 2017
$
(21,368
)



$
(3,744
)



$
(25,112
)

 
 Pension and Other Postretirement Benefits



 Derivative Instruments



 Total
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
Balance December 31, 2017
$
(24,421
)



$
(2,562
)



$
(26,983
)
OCI (loss) before reclassifications
(5,790
)



(96
)



(5,886
)
Amounts reclassified from accumulated other comprehensive loss
1,883


 (a)

865


 (b)

2,748

Reclassification of income tax effect related to tax reform
(4,440
)



(598
)



(5,038
)
Balance June 30, 2018
$
(32,768
)



$
(2,391
)



$
(35,159
)










Balance December 31, 2016
$
(20,671
)



$
(4,752
)



$
(25,423
)
OCI (loss) before reclassifications
(2,121
)



(763
)



(2,884
)
Amounts reclassified from accumulated other comprehensive loss
1,424


 (a)

1,771


 (b)

3,195

Balance June 30, 2017
$
(21,368
)



$
(3,744
)



$
(25,112
)

(a)
These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost.  See Note 5.
(b)
These amounts represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA.  See Note 7.