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Business Segments and Geographic Areas (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Customers
Dec. 31, 2014
USD ($)
Customers
Dec. 31, 2013
USD ($)
Customers
Segment Reporting Information [Line Items]                      
Net sales $ 191,017 $ 169,184 $ 181,027 $ 177,940 $ 195,003 $ 174,961 $ 188,150 $ 181,941 $ 719,168 $ 740,055 $ 762,704
Number of customer representing over 10% of consolidated net sales | Customers                 0 0 0
United States [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 $ 361,452 $ 360,960 $ 375,473
Canada [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 57,629 63,686 73,457
United Kingdom [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 26,703 30,496 28,471
Japan [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 37,809 37,230 36,705
Australia [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 33,810 38,711 38,752
All other countires [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 201,765 208,972 209,846
Orthopedic Surgery [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 388,948 402,750 410,171
General Surgery [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 274,190 279,356 286,747
Surgical Visualization [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 $ 56,030 $ 57,949 $ 65,786