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Changes in Accumulated Other Comprehensive Loss
 9 Months Ended
Sep. 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 nine months ended September 30, 2016 and 2015 (dollars in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
$
(43,719
)
 
$
(65,600
)
 
$
(44,748
)
 
$
(68,141
)
Derivative Instruments
 
 
 
 
 
 
 
OCI (loss) before reclassifications
(29
)
  
(151
)
 
(595
)
 
(926
)
Amounts reclassified from accumulated other comprehensive loss (a)
798

 
892

 
2,564

 
3,742

Net current period OCI (loss)
769

 
741

  
1,969

  
2,816

Pension and Other Postretirement Benefits
 
 
 
 
 
 
 
OCI (loss) before reclassifications
—

 
—

 
(1,585
)
 
(969
)
Amounts reclassified from accumulated other comprehensive loss (b)
804

 
869

 
2,218

 
2,304

Net current period OCI (loss)
804

 
869

 
633

 
1,335

Balance at end of period
$
(42,146
)
 
$
(63,990
)
 
$
(42,146
)
 
$
(63,990
)

(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 nine months ended September 30, 2016 and 2015 (dollars in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
$
(25,928
)
 
$
(45,651
)
 
$
(27,097
)
 
$
(48,333
)
Derivative Instruments
 
 
 
 
 
 
 
OCI (loss) before reclassifications
(29
)
  
(151
)
 
(595
)
 
(926
)
Amounts reclassified from accumulated other comprehensive loss (a)
798

 
892

 
2,564

 
3,742

Net current period OCI (loss)
769

 
741

  
1,969

  
2,816

Pension and Other Postretirement Benefits
 
 
 
 
 
 
 
OCI (loss) before reclassifications
—

 
—

 
(1,521
)
 
(927
)
Amounts reclassified from accumulated other comprehensive loss (b)
799

 
870

 
2,289

 
2,404

Net current period OCI (loss)
799

 
870

 
768

 
1,477

Balance at end of period
$
(24,360
)
 
$
(44,040
)
 
$
(24,360
)
 
$
(44,040
)

(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.