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Changes in Accumulated Other Comprehensive Loss
 3 Months Ended
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Changes in Accumulated Other Comprehensive Loss
Comprehensive Loss
 
The following tables show the changes in accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component for the three months ended March 31, 2015 and 2014 (dollars in thousands):
 
Three Months Ended March 31, 2015
 
Three Months Ended March 31, 2014
 
Derivative
Instruments
 
Pension and 
Other
Postretirement
Benefits
 
Total
 
Derivative
Instruments
 
Pension and  
Other
Postretirement
Benefits
 
Total
Beginning balance, January 1
$
(10,385
)

$
(57,756
)

$
(68,141
)
 
$
(23,058
)

$
(54,995
)

$
(78,053
)
OCI (loss) before reclassifications
(800
)
 
—


(800
)
 
(422
)

—


(422
)
Amounts reclassified from accumulated other comprehensive loss
1,976

(a)
583

(b)
2,559

 
3,116

(a)
457

(b)
3,573

Net current period OCI
1,176

 
583


1,759

 
2,694

 
457


3,151

Ending balance, March 31,
$
(9,209
)

$
(57,173
)

$
(66,382
)
 
$
(20,364
)

$
(54,538
)

$
(74,902
)

(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 months ended March 31, 2015 and 2014 (dollars in thousands):
 
 
Three Months Ended March 31, 2015
 
Three Months Ended March 31, 2014
 
Derivative
Instruments
 
Pension and  
Other
Postretirement
Benefits
 
Total
 
Derivative
Instruments
 
Pension and 
Other
Postretirement
Benefits
 
Total
Beginning balance, January 1
$
(10,385
)

$
(37,948
)

$
(48,333
)
 
$
(23,059
)

$
(30,313
)

$
(53,372
)
OCI (loss) before reclassifications
(800
)
 
—


(800
)
 
(421
)

—


(421
)
Amounts reclassified from accumulated other comprehensive loss
1,976

(a)
681

(b)
2,657

 
3,116

(a)
566

(b)
3,682

Net current period OCI
1,176

 
681


1,857

 
2,695

 
566


3,261

Ending balance, March 31,
$
(9,209
)

$
(37,267
)

$
(46,476
)
 
$
(20,364
)
 
$
(29,747
)

$
(50,111
)

(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.