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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)