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)