Business Segments and Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 Customers	Dec. 31, 2013 Customers	Dec. 31, 2012 Customers
Segment Reporting Information [Line Items]
Net sales	$ 195,003	$ 174,961	$ 188,150	$ 181,941	$ 203,442	$ 179,255	$ 192,993	$ 187,014	$ 740,055	$ 762,704	$ 767,140
Number of customer representing over 10% of consolidated net sales									0	0	0
United States
Segment Reporting Information [Line Items]
Net sales									360,960	375,473	382,256
Canada
Segment Reporting Information [Line Items]
Net sales									63,686	73,457	73,746
United Kingdom
Segment Reporting Information [Line Items]
Net sales									30,496	28,471	31,653
Japan
Segment Reporting Information [Line Items]
Net sales									37,230	36,705	33,997
Australia
Segment Reporting Information [Line Items]
Net sales									38,711	38,752	40,835
All other countires
Segment Reporting Information [Line Items]
Net sales									208,972	209,846	204,653
Orthopedic Surgery [Member]
Segment Reporting Information [Line Items]
Net sales									402,750	410,171	413,891
General Surgery [Member]
Segment Reporting Information [Line Items]
Net sales									279,356	286,747	286,606
Surgical Visualization [Member]
Segment Reporting Information [Line Items]
Net sales									$ 57,949	$ 65,786	$ 66,643