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Changes in Accumulated Other Comprehensive Loss
 9 Months Ended
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Changes in Accumulated Other Comprehensive Loss
Changes in Accumulated Other Comprehensive Loss
 
The following tables show the changes in accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component for the three and nine months ended September 30, 2015 and 2014 (dollars in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Balance at beginning of the period
$
(65,600
)
 
$
(74,217
)
 
$
(68,141
)
 
$
(78,053
)
 
 
 
 
 
 
 
 
Derivative Instruments
 
 
 
 
 
 
 
OCI (loss) before reclassifications
(151
)
 
(91
)
 
(926
)
 
(472
)
Amounts reclassified from accumulated other comprehensive loss (a)
892

 
5,939

 
3,742

 
11,009

Net current period OCI (loss)
741

 
5,848

 
2,816

  
10,537

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

 
5,231

 
(969
)
 
3,159

Amounts reclassified from accumulated other comprehensive loss (b)
869

 
736

 
2,304

 
1,955

Net current period OCI (loss)
869

 
5,967

 
1,335

 
5,114

 
 
 
 
 
 
 
 
Ending balance, September 30
$
(63,990
)
 
$
(62,402
)
 
$
(63,990
)
 
$
(62,402
)
(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 7.
(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
Changes in Accumulated Other Comprehensive Loss
 
The following tables show the changes in accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component for the three and nine months ended September 30, 2015 and 2014 (dollars in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Balance at beginning of the period
$
(45,651
)
 
$
(49,400
)
 
$
(48,333
)
 
$
(53,372
)
 
 
 
 
 
 
 
 
Derivative Instruments
 
 
 
 
 
 
 
OCI (loss) before reclassifications
(151
)
  
(91
)
 
(926
)
 
(472
)
Amounts reclassified from accumulated other comprehensive loss (a)
892

 
5,940

 
3,742

 
11,010

Net current period OCI (loss)
741

 
5,849

  
2,816

  
10,538

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

 
—

 
(927
)
 
(2,041
)
Amounts reclassified from accumulated other comprehensive loss (b)
870

 
735

 
2,404

 
2,059

Net current period OCI (loss)
870

 
735

 
1,477

 
18

 
 
 
 
 
 
 
 
Ending balance, September 30
$
(44,040
)
 
$
(42,816
)
 
$
(44,040
)
 
$
(42,816
)
(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 7.
(b)
These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost.  See Note 4.