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Business segment information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 unit segment | Dec. 31, 2010 | Dec. 31, 2009
Business segment information |  |  |  |  |  |  |  |  |  |  |
Number of GBUs |  |  |  |  |  |  |  |  | 3 |  |
Number of reporting segments |  |  |  |  |  |  |  |  | 3 |  |
Business Segments by GBU information |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 151,525 | $ 144,747 | $ 143,551 | $ 139,165 | $ 143,796 | $ 138,906 | $ 142,845 | $ 138,823 | $ 578,988 | $ 564,370 | $ 545,635
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Spine |  |  |  |  |  |  |  |  |  |  |
Business Segments by GBU information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 304,217 | 306,404 | 279,425
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 52.00% | 54.00% | 51.00%
Orthopedics |  |  |  |  |  |  |  |  |  |  |
Business Segments by GBU information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 165,904 | 154,198 | 151,054
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 29.00% | 27.00% | 28.00%
Sports Medicine |  |  |  |  |  |  |  |  |  |  |
Business Segments by GBU information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 108,867 | $ 103,768 | $ 115,156
Percent of Total Net Sales |  |  |  |  |  |  |  |  | 19.00% | 19.00% | 21.00%

X
- Definition The number of Global Business Units of the entity. + References No definition available. + Details
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- Definition The number of reporting segments of the entity. + References No definition available. + Details
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- Definition Represents the revenues of a reporting segment as a percent of total revenues of the reporting entity. + References No definition available. + Details
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X
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Details
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- Details
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