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v3.26.1

Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Changes in accumulated other comprehensive income (loss) by component |  |  |  |
Beginning balance | $ 7,110,968 | $ 6,845,982 | $ 7,087,075 | $ 6,857,478
Ending balance | 7,075,087 | 6,827,940 | 7,075,087 | 6,827,940
Accumulated Other Comprehensive Loss |  |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |  |
Beginning balance | (31,949) | (30,094) | (32,408) | (30,942)
Other comprehensive income/(loss) before reclassifications | 422 | (797) | 379 | (447)
Amounts reclassified from accumulated other comprehensive loss | 493 | 450 | 995 | 948
Ending balance | (31,034) | (30,441) | (31,034) | (30,441)
Pension and Other Postretirement Benefits |  |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |  |
Beginning balance | (32,478) | (31,163) | (32,980) | (31,661)
Other comprehensive income/(loss) before reclassifications | 404 | (503) | 404 | (503)
Amounts reclassified from accumulated other comprehensive loss | 493 | 450 | 995 | 948
Ending balance | (31,581) | (31,216) | (31,581) | (31,216)
Derivative Instruments |  |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |  |
Beginning balance | 529 | 1,069 | 572 | 719
Other comprehensive income/(loss) before reclassifications | 18 | (294) | (25) | 56
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0 | 0
Ending balance | 547 | 775 | 547 | 775
APS |  |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |  |
Beginning balance | 8,976,612 | 8,381,322 | 8,922,255 | 8,376,332
Ending balance | 9,045,321 | 8,665,366 | 9,045,321 | 8,665,366
APS | Accumulated Other Comprehensive Loss |  |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |  |
Beginning balance | (15,047) | (13,710) | (15,457) | (14,116)
Ending balance | (14,187) | (13,846) | (14,187) | (13,846)
APS | Pension and Other Postretirement Benefits |  |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |  |
Beginning balance | (15,047) | (13,710) | (15,457) | (14,116)
Other comprehensive income/(loss) before reclassifications | 454 | (504) | 454 | (504)
Amounts reclassified from accumulated other comprehensive loss | 406 | 368 | 816 | 774
Ending balance | $ (14,187) | $ (13,846) | $ (14,187) | $ (13,846)

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