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Geographic and Segment Information (Changes in Carrying Amount of Goodwill) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Goodwill, beginning $ 691,712
Goodwill as a result of acquisitions 42,418
Foreign currency adjustments 46,940
Goodwill, ending 781,070
Operating Segments | Neuromodulation  
Goodwill [Roll Forward]  
Goodwill, beginning 315,943
Goodwill as a result of acquisitions 0
Foreign currency adjustments 0
Goodwill, ending 315,943
Operating Segments | Cardiac Surgery  
Goodwill [Roll Forward]  
Goodwill, beginning 375,769
Goodwill as a result of acquisitions 0
Foreign currency adjustments 46,940
Goodwill, ending 422,709
Operating Segments | Cardiac Rhythm Management  
Goodwill [Roll Forward]  
Goodwill, beginning 0
Goodwill as a result of acquisitions 0
Foreign currency adjustments 0
Goodwill, ending 0
Other  
Goodwill [Roll Forward]  
Goodwill, beginning 0
Goodwill as a result of acquisitions 42,418
Foreign currency adjustments 0
Goodwill, ending $ 42,418