v3.26.1
Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before tax $ (220,698)   $ 31,664   $ (227,074) $ 44,354
Other Comprehensive Income (Loss), income tax 59,049   326   59,083 732
Other Comprehensive Income (Loss), Net of Tax (161,649) $ (6,342) 31,990 $ 13,096 (167,991) 45,086
Foreign Currency Translation Adjustment [Member]            
Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before Reclassifications, before Tax 125   32,283   (6,123) 46,550
Other Comprehensive Income (Loss) before Reclassifications, Tax 0   0   0 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 125   32,283   (6,123) 46,550
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 6,175   646   6,175 646
Reclassification from AOCI, Current Period, Tax 0   0   0 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 6,175   646   6,175 646
Other Comprehensive Income (Loss), before tax 6,300   32,929   52 47,196
Other Comprehensive Income (Loss), income tax 0   0   0 0
Other Comprehensive Income (Loss), Net of Tax 6,300   32,929   52 47,196
Pension and Other Postretirement Plans [Member]            
Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax         (66,535)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (137,710)   (901)   (138,464) (1,799)
Reclassification from AOCI, Current Period, Tax 35,821   231   36,018 461
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (101,889)   (670)   (102,446) (1,338)
Other Comprehensive Income (Loss), before tax (227,638)   (901)   (228,392) (1,799)
Other Comprehensive Income (Loss), income tax 59,214   231   59,411 461
Other Comprehensive Income (Loss), Net of Tax (168,424)   (670)   (168,981) (1,338)
Net Prior Service Credit [Member]            
Other Comprehensive Income (Loss) [Line Items]            
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] (497)   (521)   (993) (1,040)
Reclassification from AOCI, Current Period, Tax 129   133   259 266
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (368)   (388)   (734) (774)
Net Actuarial Gain (Loss) [Member]            
Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before Reclassifications, before Tax (89,928)   0   (89,928) 0
Other Comprehensive Income (Loss) before Reclassifications, Tax 23,393   0   23,393 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (66,535)   0   (66,535) 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] (258)   (380)   (516) (759)
Reclassification from AOCI, Current Period, Tax 67   98   134 195
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (191)   (282)   (382) (564)
Settlement Gains Included In Net Income [Member]            
Other Comprehensive Income (Loss) [Line Items]            
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (136,955)   0   (136,955) 0
Reclassification from AOCI, Current Period, Tax 35,625   0   35,625 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (101,330)   0   (101,330) 0
Cash Flow Hedges [Member]            
Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax         604  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax         334  
Other Comprehensive Income (Loss), before tax 640   (364)   1,266 (1,043)
Other Comprehensive Income (Loss), income tax (165)   95   (328) 271
Other Comprehensive Income (Loss), Net of Tax $ 475   $ (269)   $ 938 $ (772)
[1] These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension and postretirement plan cost (see Note 12) and are included in non-operating pension and postretirement benefit income in the Company’s Condensed Consolidated Statements of Operations.