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Changes in Accumulated Other Comprehensive Loss
 9 Months Ended
Sep. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Changes in Accumulated Other Comprehensive Loss Changes in Accumulated Other Comprehensive Loss
 
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 nine months ended September 30, 2019 and 2018 (dollars in thousands):
 
 Pension and Other Postretirement Benefits
 
 
 
 Derivative Instruments
 
 
 
 Total
Three Months Ended September 30
 
 
 
 
 
 
 
 
 
Balance June 30, 2019
$
(46,657
)
 
 
 
$
(979
)
 
 
 
$
(47,636
)
Amounts reclassified from accumulated other comprehensive loss
880

 
 (a)
 
218

 
(b)
 
1,098

Balance September 30, 2019
$
(45,777
)
 
 
 
$
(761
)
 
 
 
$
(46,538
)


 
 
 

 
 
 

Balance June 30, 2018
$
(54,233
)
 
 
 
$
(2,391
)
 
 
 
$
(56,624
)
Amounts reclassified from accumulated other comprehensive loss
1,099

 
 (a)
 
451

 
(b)
 
1,550

Balance September 30, 2018
$
(53,134
)
 
 
 
$
(1,940
)
 
 
 
$
(55,074
)

 
 Pension and Other Postretirement Benefits
 
 
 
 Derivative Instruments
 
 
 
 Total
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
Balance December 31, 2018
$
(45,997
)
 
 
 
$
(1,711
)
 
 
 
$
(47,708
)
OCI (loss) before reclassifications
(2,422
)
 
 
 
—

 
 
 
(2,422
)
Amounts reclassified from accumulated other comprehensive loss
2,642

 
 (a)
 
950

 
(b)
 
3,592

Balance September 30, 2019
$
(45,777
)
 
 
 
$
(761
)
 
 
 
$
(46,538
)
 
 
 
 
 
 
 
 
 
 
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
3,188

 
 (a)
 
1,316

 
(b)
 
4,504

Reclassification of income tax effect related to tax reform
(7,954
)
 
 (c)
 
(598
)
 
 (c)
 
(8,552
)
Balance September 30, 2018
$
(53,134
)
 
 
 
$
(1,940
)
 
 
 
$
(55,074
)

(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.
(c)
In 2018, the company adopted new accounting guidance and elected to reclassify income tax effects of the Tax Act on items within accumulated other comprehensive income to retained earnings.
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 nine months ended September 30, 2019 and 2018 (dollars in thousands): 
 
 Pension and Other Postretirement Benefits
 
 
 
 Derivative Instruments
 
 
 
 Total
Three Months Ended September 30
 
 
 
 
 
 
 
 
 
Balance June 30, 2019
$
(26,297
)
 
 
 
$
(979
)
 
 
 
$
(27,276
)
Amounts reclassified from accumulated other comprehensive loss
755

 
 (a)
 
218

 
 (b)
 
973

Balance September 30, 2019
$
(25,542
)
 
 
 
$
(761
)
 
 
 
$
(26,303
)


 
 
 

 
 
 

Balance June 30, 2018
$
(32,768
)
 
 
 
$
(2,391
)
 
 
 
$
(35,159
)
Amounts reclassified from accumulated other comprehensive loss
952

 
 (a)
 
451

 
 (b)
 
1,403

Balance September 30, 2018
$
(31,816
)
 
 
 
$
(1,940
)
 
 
 
$
(33,756
)

 
 Pension and Other Postretirement Benefits
 
 
 
 Derivative Instruments
 
 
 
 Total
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
Balance December 31, 2018
$
(25,396
)
 
 
 
$
(1,711
)
 
 
 
$
(27,107
)
OCI (loss) before reclassifications
(2,414
)
 
 
 
—

 
 
 
(2,414
)
Amounts reclassified from accumulated other comprehensive loss
2,268

 
 (a)
 
950

 
 (b)
 
3,218

Balance September 30, 2019
$
(25,542
)
 
 
 
$
(761
)
 
 
 
$
(26,303
)
 
 
 
 
 
 
 
 
 
 
Balance December 31, 2017
$
(24,421
)
 
 
 
$
(2,562
)
 
 
 
$
(26,983
)
OCI (loss) before reclassifications
(5,791
)
 
 
 
(96
)
 
 
 
(5,887
)
Amounts reclassified from accumulated other comprehensive loss
2,836

 
 (a)
 
1,316

 
 (b)
 
4,152

Reclassification of income tax effect related to tax reform
(4,440
)
 
 (c)
 
(598
)
 
 (c)
 
(5,038
)
Balance September 30, 2018
$
(31,816
)
 
 
 
$
(1,940
)
 
 
 
$
(33,756
)


(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.
(c)
In 2018, the company adopted new accounting guidance and elected to reclassify income tax effects of the Tax Act on items within accumulated other comprehensive income to retained earnings.