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Benefit Plans Benefit Plans (Detail 7) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost, net $ 17,236 $ 19,501 $ 16,252
Defined Benefit Plan, Interest Cost 15,168 20,641 28,081
Expected return on plan assets (40,949) (46,407) (45,910)
Amortization of Actuarial (Gains) Losses and Plan Amendments 15,962 13,018 2,877
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 7,963 0 0
Net periodic pension cost / (benefit) 15,380 6,753 1,300
United States Pension Plans of US Entity, Defined Benefit [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost, net 432 837 893
Defined Benefit Plan, Interest Cost 4,428 6,431 6,396
Expected return on plan assets (7,781) (9,575) (8,549)
Amortization of Actuarial (Gains) Losses and Plan Amendments 7,606 7,626 4,800
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 7,963 0 0
Net periodic pension cost / (benefit) 12,648 5,319 3,540
Foreign Pension Plans, Defined Benefit [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost, net 16,804 18,664 15,189
Defined Benefit Plan, Interest Cost 10,664 14,071 21,445
Expected return on plan assets (33,168) (36,832) (37,361)
Amortization of Actuarial (Gains) Losses and Plan Amendments 12,923 10,639 292
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0
Net periodic pension cost / (benefit) 7,223 6,542 (435)
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost, net 0 0 170
Defined Benefit Plan, Interest Cost 76 139 240
Amortization of Actuarial (Gains) Losses and Plan Amendments (4,567) (5,247) (2,215)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0 0
Net periodic pension cost / (benefit) $ (4,491) $ (5,108) $ (1,805)