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Changes in Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]  
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 six months ended June 30, 2017 and 2016 (dollars in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Balance at beginning of period
$
(42,863
)
 
$
(43,770
)
 
$
(43,822
)
 
$
(44,748
)
Derivative Instruments
 
 
 
 
 
 
 
OCI (loss) before reclassifications
7

  
128

 
(763
)
 
(566
)
Amounts reclassified from accumulated other comprehensive loss (a)
564

 
624

 
1,771

 
1,766

Net current period OCI (loss)
571

 
752

  
1,008

 
1,200

Pension and Other Postretirement Benefits
 
 
 
 
 
 
 
OCI (loss) before reclassifications
(2,157
)
 
(1,585
)
 
(2,157
)
 
(1,585
)
Amounts reclassified from accumulated other comprehensive loss (b)
823

 
884

 
1,345

 
1,414

Net current period OCI (loss)
(1,334
)
 
(701
)
 
(812
)
 
(171
)
Balance at end of period
$
(43,626
)
 
$
(43,719
)
 
$
(43,626
)
 
$
(43,719
)

(a)
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 6.
(b)
These amounts primarily represent amortization of actuarial loss, and are included in the computation of net periodic pension cost.  See Note 4.
Arizona Public Service Company  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Changes in Accumulated Other Comprehensive Loss
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, 2017 and 2016 (dollars in thousands):
 
 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
 
2017
 
2016
2017
 
2016
Balance at beginning of period
$
(24,375
)
 
$
(26,038
)
$
(25,423
)
 
$
(27,097
)
Derivative Instruments
 
 
 
 
 
 
OCI (loss) before reclassifications
7

  
128

(763
)
 
(566
)
Amounts reclassified from accumulated other comprehensive loss (a)
564

 
624

1,771

 
1,766

Net current period OCI (loss)
571

 
752

1,008

 
1,200

Pension and Other Postretirement Benefits
 
 
 
 
 
 
OCI (loss) before reclassifications
(2,121
)
 
(1,521
)
(2,121
)
 
(1,521
)
Amounts reclassified from accumulated other comprehensive loss (b)
813

 
879

1,424

 
1,490

Net current period OCI (loss)
(1,308
)
 
(642
)
(697
)
 
(31
)
Balance at end of period
$
(25,112
)
 
$
(25,928
)
$
(25,112
)
 
$
(25,928
)

(a)
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 6.
(b)
These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost.  See Note 4.