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Pension Plans and Other Postretirement Benefits (Summary Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits | United States      
Net periodic benefit cost (income)      
Service cost $ 16,544 $ 13,471 $ 15,391
Interest cost 13,771 14,509 13,256
Expected return on plan assets (37,226) (34,632) (29,883)
Amortization of prior service cost (credit) 271 178 25
Amortization of actuarial net (gain) loss 4,674 2,951 5,139
Net periodic benefit cost (income) (1,966) (3,523) 3,928
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Actuarial net (gain) loss (4,933) (36,814) 29,215
Prior service cost (credit) 65 1,013 0
Amortization of actuarial net gain (loss) (4,674) (2,951) (5,139)
Amortization of prior service (cost) credit (271) (178) (25)
Total recognized in other comprehensive income (loss) (9,813) (38,930) 24,051
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) (11,779) (42,453) 27,979
Pension Benefits | Foreign Retirement Plans      
Net periodic benefit cost (income)      
Service cost 8,544 6,430 7,271
Interest cost 3,866 4,768 4,514
Expected return on plan assets (9,729) (9,084) (9,918)
Amortization of prior service cost (credit) (43) (42) (81)
Amortization of actuarial net (gain) loss 1,420 938 597
Net periodic benefit cost (income) 4,058 3,010 2,383
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Actuarial net (gain) loss 33,816 11,074 4,532
Prior service cost (credit) 0 0 537
Amortization of actuarial net gain (loss) (1,420) (938) (597)
Amortization of prior service (cost) credit 43 42 81
Total recognized in other comprehensive income (loss) 32,439 10,178 4,553
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) 36,497 13,188 6,936
Postretirement Benefits | United States      
Net periodic benefit cost (income)      
Service cost 912 718 896
Interest cost 1,340 1,514 1,458
Expected return on plan assets (938) (947) (969)
Amortization of prior service cost (credit) (3,028) (3,028) (3,028)
Amortization of actuarial net (gain) loss 0 0 0
Net periodic benefit cost (income) (1,714) (1,743) (1,643)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Actuarial net (gain) loss 2,410 3,049 (2,190)
Prior service cost (credit) 0 0 0
Amortization of actuarial net gain (loss) 0 0 0
Amortization of prior service (cost) credit 3,028 3,028 3,028
Total recognized in other comprehensive income (loss) 5,438 6,077 838
Total recognized in net periodic benefit cost (income) and other comprehensive income (loss) $ 3,724 $ 4,334 $ (805)