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Changes in Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Changes in Accumulated Other Comprehensive Loss | Changes in Accumulated Other Comprehensive Loss The following table shows the changes in Pinnacle West's consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Three Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance March 31, 2020 | $ | (55,317 | ) |  |  |  | $ | (262 | ) |  |  |  | $ | (55,579 | )
OCI (loss) before reclassifications | (2,008 | ) |  |  |  | (1,549 | ) |  |  |  | (3,557 | )
Amounts reclassified from accumulated other comprehensive loss | 999 |  |  | (a) |  | 262 |  |  | (b) |  | 1,261 |
Balance June 30, 2020 | $ | (56,326 | ) |  |  |  | $ | (1,549 | ) |  |  |  | $ | (57,875 | )
Balance March 31, 2019 | $ | (45,118 | ) |  |  |  | $ | (1,383 | ) |  |  |  | $ | (46,501 | )
OCI (loss) before reclassifications | (2,422 | ) |  |  |  | — |  |  |  |  | (2,422 | )
Amounts reclassified from accumulated other comprehensive loss | 883 |  |  | (a) |  | 404 |  |  | (b) |  | 1,287 |
Balance June 30, 2019 | $ | (46,657 | ) |  |  |  | $ | (979 | ) |  |  |  | $ | (47,636 | )
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Six Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance December 31, 2019 | $ | (56,522 | ) |  |  |  | $ | (574 | ) |  |  |  | $ | (57,096 | )
OCI (loss) before reclassifications | (2,008 | ) |  |  |  | (1,257 | ) |  |  |  | (3,265 | )
Amounts reclassified from accumulated other comprehensive loss | 2,204 |  |  | (a) |  | 282 |  |  | (b) |  | 2,486 |
Balance June 30, 2020 | $ | (56,326 | ) |  |  |  | $ | (1,549 | ) |  |  |  | $ | (57,875 | )
Balance December 31, 2018 | $ | (45,997 | ) |  |  |  | $ | (1,711 | ) |  |  |  | $ | (47,708 | )
OCI (loss) before reclassifications | (2,422 | ) |  |  |  | — |  |  |  |  | (2,422 | )
Amounts reclassified from accumulated other comprehensive loss | 1,762 |  |  | (a) |  | 732 |  |  | (b) |  | 2,494 |
Balance June 30, 2019 | $ | (46,657 | ) |  |  |  | $ | (979 | ) |  |  |  | $ | (47,636 | )
(a) | These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 5.
(b) These amounts primarily 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. 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 and six months ended June 30, 2020 and 2019 (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Three Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance March 31, 2020 | $ | (33,935 | ) |  |  |  | $ | (262 | ) |  |  |  | $ | (34,197 | )
OCI (loss) before reclassifications | (1,951 | ) |  |  |  | — |  |  |  |  | (1,951 | )
Amounts reclassified from accumulated other comprehensive loss | 861 |  |  | (a) |  | 262 |  |  | (b) |  | 1,123 |
Balance June 30, 2020 | $ | (35,025 | ) |  |  |  | $ | — |  |  |  |  | $ | (35,025 | )
Balance March 31, 2019 | $ | (24,644 | ) |  |  |  | $ | (1,383 | ) |  |  |  | $ | (26,027 | )
OCI (loss) before reclassifications | (2,414 | ) |  |  |  | — |  |  |  |  | (2,414 | )
Amounts reclassified from accumulated other comprehensive loss | 761 |  |  | (a) |  | 404 |  |  | (b) |  | 1,165 |
Balance June 30, 2019 | $ | (26,297 | ) |  |  |  | $ | (979 | ) |  |  |  | $ | (27,276 | )
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Six Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance December 31, 2019 | $ | (34,948 | ) |  |  |  | $ | (574 | ) |  |  |  | $ | (35,522 | )
OCI (loss) before reclassifications | (1,951 | ) |  |  |  | 292 |  |  |  |  | (1,659 | )
Amounts reclassified from accumulated other comprehensive loss | 1,874 |  |  | (a) |  | 282 |  |  | (b) |  | 2,156 |
Balance June 30, 2020 | $ | (35,025 | ) |  |  |  | $ | — |  |  |  |  | $ | (35,025 | )
Balance December 31, 2018 | $ | (25,396 | ) |  |  |  | $ | (1,711 | ) |  |  |  | $ | (27,107 | )
OCI (loss) before reclassifications | (2,414 | ) |  |  |  | — |  |  |  |  | (2,414 | )
Amounts reclassified from accumulated other comprehensive loss | 1,513 |  |  | (a) |  | 732 |  |  | (b) |  | 2,245 |
Balance June 30, 2019 | $ | (26,297 | ) |  |  |  | $ | (979 | ) |  |  |  | $ | (27,276 | )
(a) | These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 5.
(b) These amounts primarily 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.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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