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Changes in Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of changes in accumulated other comprehensive loss including reclassification adjustments, net of tax, by component
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 months ended March 31, 2017 and 2016 (dollars in thousands):
 
Three Months Ended
 
 
March 31,
 
 
2017
 
2016
 
Balance at beginning of period
$
(43,822
)
 
$
(44,748
)
 
Derivative Instruments
 
 
 
 
OCI (loss) before reclassifications
(770
)
  
(693
)
 
Amounts reclassified from accumulated other comprehensive loss (a)
1,207

 
1,141

 
Net current period OCI (loss)
437

 
448

  
Pension and Other Postretirement Benefits
 
 
 
 
Amounts reclassified from accumulated other comprehensive loss (b)
522

 
530

 
Net current period OCI (loss)
522

 
530

 
Balance at end of period
$
(42,863
)
 
$
(43,770
)
 

(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]  
Schedule of changes in accumulated other comprehensive loss including reclassification adjustments, net of tax, by component
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 months ended March 31, 2017 and 2016 (dollars in thousands):
 
 
Three Months Ended
 
March 31,
 
2017
 
2016
Balance at beginning of period
$
(25,423
)
 
$
(27,097
)
Derivative Instruments
 
 
 
OCI (loss) before reclassifications
(770
)
  
(693
)
Amounts reclassified from accumulated other comprehensive loss (a)
1,207

 
1,141

Net current period OCI (loss)
437

 
448

Pension and Other Postretirement Benefits
 
 
 
Amounts reclassified from accumulated other comprehensive loss (b)
611

 
611

Net current period OCI (loss)
611

 
611

Balance at end of period
$
(24,375
)
 
$
(26,038
)

(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.