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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |
Goodwill, gross |  |  | $ 296,502
Accumulated impairment losses |  |  | (46,738)
Goodwill [Roll Forward] |  |  |
Goodwill at December 31, 2013 | 249,764 | [1] |
Goodwill acquired during period | 105,331 |  |
Foreign currency translation | (5,521) |  |
Goodwill at September 30, 2014 | 349,574 |  |
U.S. Neurosurgery |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  |  | 95,165
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill at December 31, 2013 | 95,165 |  |
Goodwill acquired during period | 95,373 |  |
Foreign currency translation | (2,966) |  |
Goodwill at September 30, 2014 | 187,572 |  |
U.S. Instruments |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  |  | 58,033
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill at December 31, 2013 | 58,033 |  |
Goodwill acquired during period | 0 |  |
Foreign currency translation | (901) |  |
Goodwill at September 30, 2014 | 57,132 |  |
U.S. Extremities |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  |  | 61,079
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill at December 31, 2013 | 61,079 |  |
Goodwill acquired during period | 0 |  |
Foreign currency translation | (948) |  |
Goodwill at September 30, 2014 | 60,131 |  |
U.S. Spine And Other [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  |  | 56,325
Accumulated impairment losses |  |  | (46,738)
Goodwill [Roll Forward] |  |  |
Goodwill at December 31, 2013 | 9,587 |  |
Goodwill acquired during period | 0 |  |
Foreign currency translation | (149) |  |
Goodwill at September 30, 2014 | 9,438 |  |
International |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  |  | 25,900
Accumulated impairment losses |  |  | 0
Goodwill [Roll Forward] |  |  |
Goodwill at December 31, 2013 | 25,900 |  |
Goodwill acquired during period | 9,958 |  |
Foreign currency translation | (557) |  |
Goodwill at September 30, 2014 | $ 35,301 |  |
[1] | See Note 1 of these condensed consolidated financial statements for discussion of the impact of the change in accounting for the medical device excise tax.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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