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Pension Plans and Other Postretirement Benefits (Net Periodic Benefit Cost (Income) For Pension And Postretirement Benefit Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Plan [Member] | Domestic Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3,599 $ 3,501 $ 11,543 $ 10,259
Interest cost 3,257 3,248 9,942 9,966
Expected return on plan assets (7,523) (6,604) (22,413) (19,609)
Amortization of prior service cost (credit) 7 7 20 20
Amortization of actuarial net (gain) loss 1,172 1,085 3,854 3,544
Net periodic benefit cost (income) 512 1,237 2,946 4,180
Pension Plan [Member] | Foreign Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1,975 1,942 6,114 5,645
Interest cost 1,105 1,076 3,425 3,141
Expected return on plan assets (2,423) (2,127) (7,519) (6,229)
Amortization of prior service cost (credit) (20) (20) (62) (58)
Amortization of actuarial net (gain) loss 148 243 456 699
Net periodic benefit cost (income) 785 1,114 2,414 3,198
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 239 208 672 581
Interest cost 355 400 1,094 1,186
Expected return on plan assets (228) (281) (726) (898)
Amortization of prior service cost (credit) (757) (757) (2,271) (2,271)
Amortization of actuarial net (gain) loss 0 0 0 0
Net periodic benefit cost (income) $ (391) $ (430) $ (1,231) $ (1,402)