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Employee Benefits Schedule of Allocation of Plan Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Allocation of Plan Assets [Table Text Block]
As of December 31, 2016, the weighted-average target and actual asset allocations relating to our domestic and foreign pension plans' assets are listed below.
 
 
 
 
December 31,
Asset Class
 
2017 Target Allocation
 
2016
 
2015
Equity securities
 
24
%
 
23
%
 
22
%
Fixed income securities
 
29
%
 
26
%
 
38
%
Real estate
 
8
%
 
6
%
 
7
%
Other
 
39
%
 
45
%
 
33
%
Total
 
100
%
 
100
%
 
100
%