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Business Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Net sales $ 197,154 $ 193,433 $ 383,720 $ 374,634
Orthopedic Surgery [Member]        
Segment Reporting Information [Line Items]        
Net sales 105,561 105,863 209,350 211,164
General Surgery [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 91,593 $ 87,570 $ 174,370 $ 163,470