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Changes in Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2015
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 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] |
Schedule of changes in accumulated other comprehensive loss including reclassification adjustments, net of tax, by component | 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.

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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=36458714&loc=SL7669686-108580 + Details
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