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Benefit Plans Benefit Plans (Detail 1) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation, Beginning $ 975,956 $ 1,031,760  
Defined Benefit Plans, Service Cost and Other 30,368 32,351  
Defined Benefit Plan, Interest Cost 15,168 20,641 $ 28,081
Defined Benefit Plan, Actuarial Gain (Loss) 43,949 (14,991)  
Defined Benefit Plan, Plan Amendments 150 (12,228)  
Defined Benefit Plan, Benefits Paid (56,773) (56,982)  
Foreign Currency Exchange Rate Changes, Benefit Obligation (29,401) (24,595)  
Benefit Obligation, Ending 979,417 975,956 1,031,760
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair Value of Plan Assets, Beginning 750,630    
Defined Benefit Plan, Actual Return on Plan Assets 22,803 (8,832)  
Defined Benefit Plan, Contributions by Employer 23,046 23,616  
Defined Benefit Plan, Contributions by Plan Participants 13,427 13,013  
Defined Benefits Plan, Benefits Paid and Other Charges 56,773 56,982  
Foreign Currency Exchange Rate Changes, Plan Assets (26,946) (9,323)  
Fair Value of Plan Assets, Ending 738,167 750,630  
Defined Benefit Plan, Funded Status of Plan (159,145) (131,241)  
United States Pension Plans of US Entity, Defined Benefit [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation, Beginning 154,415 164,367  
Defined Benefit Plans, Service Cost and Other 432 837  
Defined Benefit Plan, Interest Cost 4,428 6,431 6,396
Defined Benefit Plan, Actuarial Gain (Loss) 845 (10,145)  
Defined Benefit Plan, Plan Amendments 0 0  
Defined Benefit Plan, Benefits Paid (21,965) (7,075)  
Foreign Currency Exchange Rate Changes, Benefit Obligation 0 0  
Benefit Obligation, Ending 138,155 154,415 164,367
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Actual Return on Plan Assets 6,876 (5,907)  
Defined Benefit Plan, Contributions by Employer 74 70  
Defined Benefit Plan, Contributions by Plan Participants 0 0  
Defined Benefits Plan, Benefits Paid and Other Charges 21,965 7,075  
Foreign Currency Exchange Rate Changes, Plan Assets 0 0  
Defined Benefit Plan, Funded Status of Plan (34,052) (35,297)  
Foreign Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation, Beginning 818,269 863,639  
Defined Benefit Plans, Service Cost and Other 29,936 31,514  
Defined Benefit Plan, Interest Cost 10,664 14,071 21,445
Defined Benefit Plan, Actuarial Gain (Loss) 42,786 (4,959)  
Defined Benefit Plan, Plan Amendments 0 (12,391)  
Defined Benefit Plan, Benefits Paid (33,977) (49,010)  
Foreign Currency Exchange Rate Changes, Benefit Obligation (29,401) (24,595)  
Benefit Obligation, Ending 838,277 818,269 863,639
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Actual Return on Plan Assets 15,927 (2,925)  
Defined Benefit Plan, Contributions by Employer 22,291 22,812  
Defined Benefit Plan, Contributions by Plan Participants 13,277 12,850  
Defined Benefits Plan, Benefits Paid and Other Charges 33,977 49,010  
Foreign Currency Exchange Rate Changes, Plan Assets (26,946) (9,323)  
Defined Benefit Plan, Funded Status of Plan (122,108) (92,672)  
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation, Beginning 3,272 3,754  
Defined Benefit Plans, Service Cost and Other 0 0  
Defined Benefit Plan, Interest Cost 76 139 240
Defined Benefit Plan, Actuarial Gain (Loss) 318 113  
Defined Benefit Plan, Plan Amendments 150 163  
Defined Benefit Plan, Benefits Paid (831) (897)  
Foreign Currency Exchange Rate Changes, Benefit Obligation 0 0  
Benefit Obligation, Ending 2,985 3,272 $ 3,754
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Actual Return on Plan Assets 0 0  
Defined Benefit Plan, Contributions by Employer 681 734  
Defined Benefit Plan, Contributions by Plan Participants 150 163  
Defined Benefits Plan, Benefits Paid and Other Charges 831 897  
Foreign Currency Exchange Rate Changes, Plan Assets 0 0  
Defined Benefit Plan, Funded Status of Plan $ (2,985) $ (3,272)