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Restructuring Charges (Number of Positions Eliminated Rollfoward) (Details) - employee
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring and Related Cost, Number of Positions Eliminated [Roll Forward]    
Planned reductions - January 1 47 188
Additional planned reductions 102 28
Actual reductions and reversals (45) (133)
Planned reductions - March 31 104 83