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Pension Plans and Other Postretirement Benefits (Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Domestic Pension Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2,663 $ 2,157
Interest cost 2,384 2,359
Expected return on plan assets (3,617) (3,301)
Amortization of prior service (credit) cost 4 53
Amortization of actuarial net loss 1,801 1,292
Net periodic benefit cost 3,235 2,560
Domestic Postretirement Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 499 522
Interest cost 682 787
Expected return on plan assets (364) (373)
Amortization of prior service (credit) cost 2 2
Amortization of actuarial net loss 0 0
Net periodic benefit cost 819 938
Foreign Pension Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1,354 1,167
Interest cost 1,357 1,333
Expected return on plan assets (1,729) (1,506)
Amortization of prior service (credit) cost (2) (38)
Amortization of transition obligation 0 0
Amortization of actuarial net loss 354 276
Net periodic benefit cost 1,334 1,232
Foreign Postretirement Benefits [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 8 7
Interest cost 27 27
Expected return on plan assets 0 0
Amortization of prior service (credit) cost 0 0
Amortization of transition obligation 13 13
Amortization of actuarial net loss 10 8
Net periodic benefit cost $ 58 $ 55