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Changes in Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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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.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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