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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
Mar. 31, 2016
Mar. 31, 2015
Domestic Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 3,107 $ 3,240
Interest cost 3,266 2,983
Expected return on plan assets (5,753) (5,092)
Amortization of prior service cost (credit) (16) 25
Amortization of actuarial net (gain) loss 1,303 1,735
Net periodic benefit cost (income) 1,907 2,891
Domestic Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 161 711
Interest cost 420 757
Expected return on plan assets (318) (322)
Amortization of prior service cost (credit) (757) 0
Amortization of actuarial net (gain) loss 0 0
Net periodic benefit cost (income) (494) 1,146
Foreign Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1,843 1,945
Interest cost 1,274 1,269
Expected return on plan assets (1,731) (1,788)
Amortization of prior service cost (credit) (22) (24)
Amortization of actuarial net (gain) loss 262 398
Net periodic benefit cost (income) $ 1,626 $ 1,800