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Employee Benefit Plans - Assumptions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Document Fiscal Year Focus 2017    
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Ultimate medical trend rate 2.30%    
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Annual rate of increase in the per capita cost of covered benefits 3.50%    
Year that rate reaches ultimate trend rate   2027  
Effect of one-percentage point change in assumed health care cost trend rates [Abstract]      
Effect of one percentage point increase on accumulated postretirement benefit obligation $ 105    
Effect of one percentage point decrease on accumulated postretirement benefit obligation   $ (105)  
U.S. Pension Plan, Defined Benefit [Member]      
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 3.65% 4.10%  
Average wage increase 4.00% 4.00%  
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 4.10% 4.40% 4.05%
Average wage increase 4.00% 4.00% 4.00%
Expected return on plan assets 7.25% 7.25% 7.75%
Non-U.S. Pension Plans, Defined Benefit [Member]      
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 1.94% 2.06%  
Average wage increase 2.33% 2.34%  
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 2.06% 2.32% 2.31%
Average wage increase 2.34% 2.25% 2.50%
Expected return on plan assets 4.73% 4.95% 4.85%
Supplemental Employee Retirement Plans, Defined Benefit [Member]      
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 3.57% 3.90%  
Average wage increase 4.50% 4.50%  
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 3.97% 4.18% 3.96%
Average wage increase 4.50% 4.50% 4.50%
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 3.50% 6.49%  
Ultimate medical trend rate 2.33% 5.00%  
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 6.49% 4.00% 3.75%