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Benefit Plans Benefit Plans (Detail 8) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of Net Prior Service Cost (Credit) $ (5,763)
Amortization of Net Gains (Losses) 26,896
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 21,133
United States Pension Plans of US Entity, Defined Benefit [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of Net Prior Service Cost (Credit) 0
Amortization of Net Gains (Losses) 6,555
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 6,555
Foreign Pension Plans, Defined Benefit [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of Net Prior Service Cost (Credit) (4,984)
Amortization of Net Gains (Losses) 22,236
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 17,252
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of Net Prior Service Cost (Credit) (779)
Amortization of Net Gains (Losses) (1,895)
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year $ (2,674)