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Geographic and Segment Information (Changes in Carrying Amount of Goodwill) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Goodwill, beginning $ 784,242
Goodwill as a result of acquisitions 201,513
Foreign currency adjustments (20,058)
Goodwill, ending 965,697
Operating Segments | Neuromodulation  
Goodwill [Roll Forward]  
Goodwill, beginning 315,943
Goodwill as a result of acquisitions 82,596
Foreign currency adjustments 0
Goodwill, ending 398,539
Operating Segments | Cardiac Surgery  
Goodwill [Roll Forward]  
Goodwill, beginning 425,882
Goodwill as a result of acquisitions 118,917
Foreign currency adjustments (20,058)
Goodwill, ending 524,741
Other  
Goodwill [Roll Forward]  
Goodwill, beginning 42,417
Goodwill as a result of acquisitions 0
Foreign currency adjustments 0
Goodwill, ending $ 42,417