Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 112,632	$ 70,621	$ 289,154
Other comprehensive (loss) income before reclassifications	(85,999)	18,857	(29,913)
Amounts reclassified from accumulated other comprehensive loss	30,747	39,962	30,925
Other comprehensive (loss) income, net of tax	(55,252)	58,819	1,012
Ending balance	60,653	112,632	70,621
Cash flow hedges
Accumulated Other Comprehensive Income (Loss)
Beginning balance	3,803	(1,411)	337
Other comprehensive (loss) income before reclassifications	9,246	5,069	(1,861)
Amounts reclassified from accumulated other comprehensive loss	(546)	145	113
Other comprehensive (loss) income, net of tax	8,700	5,214	(1,748)
Ending balance	12,503	3,803	(1,411)
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(6,249)	402	2,849
Other comprehensive (loss) income before reclassifications	(33,198)	(6,662)	5,319
Amounts reclassified from accumulated other comprehensive loss	7	11	(7,766)
Other comprehensive (loss) income, net of tax	(33,191)	(6,651)	(2,447)
Ending balance	(39,440)	(6,249)	402
Pension and postretirement benefit plans
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(756,639)	(851,063)	(819,018)
Other comprehensive (loss) income before reclassifications	9,297	54,618	(70,623)
Amounts reclassified from accumulated other comprehensive loss	31,286	39,806	38,578
Other comprehensive (loss) income, net of tax	40,583	94,424	(32,045)
Ending balance	(716,056)	(756,639)	(851,063)
Foreign currency adjustments
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(21,227)	12,941	(24,311)
Other comprehensive (loss) income before reclassifications	(71,344)	(34,168)	37,252
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Other comprehensive (loss) income, net of tax	(71,344)	(34,168)	37,252
Ending balance	(92,571)	(21,227)	12,941
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(780,312)	(839,131)	(840,143)
Ending balance	$ (835,564)	$ (780,312)	$ (839,131)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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