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Benefit Plans Benefit Plans (Detail 3) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Plan amendments and prior service cost $ (22,667)  
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost Credit, after Tax (17,480)  
Actuarial losses (gains) 342,993  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), after tax 254,924  
Accumulated Other Comprehensive Income (Loss), before Tax 320,326 $ 289,628
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 237,444  
United States Pension Plans of US Entity, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Plan amendments and prior service cost 0  
Actuarial losses (gains) 69,528  
Accumulated Other Comprehensive Income (Loss), before Tax 69,528 83,347
Foreign Pension Plans, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Plan amendments and prior service cost (21,516)  
Actuarial losses (gains) 277,371  
Accumulated Other Comprehensive Income (Loss), before Tax 255,855 216,224
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Plan amendments and prior service cost (1,151)  
Actuarial losses (gains) (3,906)  
Accumulated Other Comprehensive Income (Loss), before Tax $ (5,057) $ (9,943)