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Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) |  |  |
Beginning balance | $ (578,433) | $ (368,576) | $ 60,653
Other comprehensive income (loss) before reclassifications | 28,903 | (72,130) | (22,165)
Amounts reclassified from accumulated other comprehensive loss | 21,136 | 84,204 | 6,484
Other comprehensive income (loss), net of tax | 50,039 | 12,074 | (15,681)
Ending balance | (802,360) | (578,433) | (368,576)
Total |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |
Beginning balance | (839,171) | (851,245) | (835,564)
Other comprehensive income (loss), net of tax | 50,039 | 12,074 | (15,681)
Ending balance | (789,132) | (839,171) | (851,245)
Cash flow hedges |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |
Beginning balance | 0 | 6,962 | 12,503
Other comprehensive income (loss) before reclassifications | 0 | 631 | 1,715
Amounts reclassified from accumulated other comprehensive loss | 0 | (7,593) | (7,256)
Other comprehensive income (loss), net of tax | 0 | (6,962) | (5,541)
Ending balance | 0 | 0 | 6,962
Available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |
Beginning balance | (29,597) | (33,463) | (39,440)
Other comprehensive income (loss) before reclassifications | 6,649 | 228 | 5,969
Amounts reclassified from accumulated other comprehensive loss | 379 | 3,638 | 8
Other comprehensive income (loss), net of tax | 7,028 | 3,866 | 5,977
Ending balance | (22,569) | (29,597) | (33,463)
Pension and postretirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |
Beginning balance | (704,818) | (757,452) | (716,056)
Other comprehensive income (loss) before reclassifications | (29,037) | (35,525) | (55,128)
Amounts reclassified from accumulated other comprehensive loss | 20,757 | 88,159 | 13,732
Other comprehensive income (loss), net of tax | (8,280) | 52,634 | (41,396)
Ending balance | (713,098) | (704,818) | (757,452)
Foreign currency adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |
Beginning balance | (104,756) | (67,292) | (92,571)
Other comprehensive income (loss) before reclassifications | 51,291 | (37,464) | 25,279
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 51,291 | (37,464) | 25,279
Ending balance | $ (53,465) | $ (104,756) | $ (67,292)

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