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Restructuring Charges (Number of Positions Eliminated Rollfoward) (Details) - employee
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring and Related Cost, Number of Positions Eliminated [Roll Forward]    
Planned reductions - January 1 188 82
Additional planned reductions 28 125
Actual reductions and reversals (133) (13)
Planned reductions - March 31 83 194