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Changes in Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2016
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, 2016 and 2015 (dollars in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
$
(43,770
)
 
$
(66,382
)
 
$
(44,748
)
 
$
(68,141
)
Derivative Instruments
 
 
 
 
 
 
 
OCI (loss) before reclassifications
128

  
25

 
(566
)
 
(775
)
Amounts reclassified from accumulated other comprehensive loss (a)
624

 
874

 
1,766

 
2,850

Net current period OCI (loss)
752

 
899

  
1,200

  
2,075

Pension and Other Postretirement Benefits
 
 
 
 
 
 
 
OCI (loss) before reclassifications
(1,585
)
 
(969
)
 
(1,585
)
 
(969
)
Amounts reclassified from accumulated other comprehensive loss (b)
884

 
852

 
1,414

 
1,435

Net current period OCI (loss)
(701
)
 
(117
)
 
(171
)
 
466

Balance at end of period
$
(43,719
)
 
$
(65,600
)
 
$
(43,719
)
 
$
(65,600
)

(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, 2016 and 2015 (dollars in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
$
(26,038
)
 
$
(46,476
)
 
$
(27,097
)
 
$
(48,333
)
Derivative Instruments
 
 
 
 
 
 
 
OCI (loss) before reclassifications
128

  
25

 
(566
)
 
(775
)
Amounts reclassified from accumulated other comprehensive loss (a)
624

 
874

 
1,766

 
2,850

Net current period OCI (loss)
752

 
899

  
1,200

  
2,075

Pension and Other Postretirement Benefits
 
 
 
 
 
 
 
OCI (loss) before reclassifications
(1,521
)
 
(927
)
 
(1,521
)
 
(927
)
Amounts reclassified from accumulated other comprehensive loss (b)
879

 
853

 
1,490

 
1,534

Net current period OCI (loss)
(642
)
 
(74
)
 
(31
)
 
607

Balance at end of period
$
(25,928
)
 
$
(45,651
)
 
$
(25,928
)
 
$
(45,651
)

(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.