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Changes in Accumulated Other Comprehensive Loss
 3 Months Ended
Mar. 31, 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 months ended March 31, 2019 and 2018 (dollars in thousands):
 
 Pension and Other Postretirement Benefits
 
 
 
 Derivative Instruments
 
 
 
 Total
 
 
 
 
 
 
 
 
 
 
Balance December 31, 2018
$
(45,997
)
 
 
 
$
(1,711
)
 
 
 
$
(47,708
)
Amounts reclassified from accumulated other comprehensive loss
879

 
 (a)
 
328

 
(b)
 
1,207

Balance March 31, 2019
$
(45,118
)
 
 
 
$
(1,383
)
 
 
 
$
(46,501
)


 
 
 

 
 
 

Balance December 31, 2017
$
(42,440
)
 
 
 
$
(2,562
)
 
 
 
$
(45,002
)
OCI (loss) before reclassifications
—

 
 
 
(96
)
 
 
 
(96
)
Amounts reclassified from accumulated other comprehensive loss
900

 
 (a)
 
409

 
(b)
 
1,309

Reclassification of income tax effect related to tax reform
(7,954
)
 
 (c)
 
(598
)
 
 (c)
 
(8,552
)
Balance March 31, 2018
$
(49,494
)
 
 
 
$
(2,847
)
 
 
 
$
(52,341
)

(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 months ended March 31, 2019 and 2018 (dollars in thousands): 
 
 Pension and Other Postretirement Benefits
 
 
 
 Derivative Instruments
 
 
 
 Total
 
 
 
 
 
 
 
 
 
 
Balance December 31, 2018
$
(25,396
)
 
 
 
$
(1,711
)
 
 
 
$
(27,107
)
Amounts reclassified from accumulated other comprehensive loss
752

 
 (a)
 
328

 
 (b)
 
1,080

Balance March 31, 2019
$
(24,644
)
 
 
 
$
(1,383
)
 
 
 
$
(26,027
)


 
 
 

 
 
 

Balance December 31, 2017
$
(24,421
)
 
 
 
$
(2,562
)
 
 
 
$
(26,983
)
OCI (loss) before reclassifications
—

 
 
 
(96
)
 
 
 
(96
)
Amounts reclassified from accumulated other comprehensive loss
857

 
 (a)
 
409

 
 (b)
 
1,266

Reclassification of income tax effect related to tax reform
(4,440
)
 
 (c)
 
(598
)
 
 (c)
 
(5,038
)
Balance March 31, 2018
$
(28,004
)
 
 
 
$
(2,847
)
 
 
 
$
(30,851
)

(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.