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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | $ 5,135,730 | $ 4,935,912
OCI (loss) before reclassifications | 24 | (6,473)
Amounts reclassified from accumulated other comprehensive loss | 5,822 | 5,293
Reclassification of income tax effect related to tax reform | (8,552) |
Ending balance | 5,348,705 | 5,135,730
Pension and Other Postretirement Benefits |  |
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | (42,440) | (39,070)
OCI (loss) before reclassifications | 102 | (6,438)
Amounts reclassified from accumulated other comprehensive loss | 4,295 | 3,068
Reclassification of income tax effect related to tax reform | (7,954) |
Ending balance | (45,997) | (42,440)
Derivative Instruments |  |
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | (2,562) | (4,752)
OCI (loss) before reclassifications | (78) | (35)
Amounts reclassified from accumulated other comprehensive loss | 1,527 | 2,225
Reclassification of income tax effect related to tax reform | (598) |
Ending balance | (1,711) | (2,562)
Accumulated Other Comprehensive Income (Loss) |  |
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | (45,002) | (43,822)
Reclassification of income tax effect related to tax reform | (8,552) |
Ending balance | (47,708) | (45,002)
ARIZONA PUBLIC SERVICE COMPANY |  |
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | 5,385,869 | 5,037,970
OCI (loss) before reclassifications | (404) | (6,919)
Amounts reclassified from accumulated other comprehensive loss | 5,318 | 5,359
Reclassification of income tax effect related to tax reform | (5,038) |
Ending balance | 5,786,797 | 5,385,869
ARIZONA PUBLIC SERVICE COMPANY | Pension and Other Postretirement Benefits |  |
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | (24,421) | (20,671)
OCI (loss) before reclassifications | (326) | (6,884)
Amounts reclassified from accumulated other comprehensive loss | 3,791 | 3,134
Reclassification of income tax effect related to tax reform | (4,440) |
Ending balance | (25,396) | (24,421)
ARIZONA PUBLIC SERVICE COMPANY | Derivative Instruments |  |
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | (2,562) | (4,752)
OCI (loss) before reclassifications | (78) | (35)
Amounts reclassified from accumulated other comprehensive loss | 1,527 | 2,225
Reclassification of income tax effect related to tax reform | (598) |
Ending balance | (1,711) | (2,562)
ARIZONA PUBLIC SERVICE COMPANY | Accumulated Other Comprehensive Income (Loss) |  |
Changes in accumulated other comprehensive income (loss) by component |  |
Beginning balance | (26,983) | (25,423)
Reclassification of income tax effect related to tax reform | (5,038) |
Ending balance | $ (27,107) | $ (26,983)

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