SUMMARY OF SIGNIFICANT ACCOUNT POLICIES (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jan. 15, 2014
Goodwill [Roll Forward]
Goodwill, gross		$ 296,502
Accumulated impairment losses		(46,738)
Goodwill at December 31, 2013	249,764
Foreign currency translation	(8,290)
Balance, December 31, 2014	363,888
Confluent Surgical, Inc.
Goodwill [Roll Forward]
Goodwill at December 31, 2013			105,331
Goodwill acquired during the period	105,331
Balance, December 31, 2014			105,331
Medtronic MicroFrance
Goodwill [Roll Forward]
Goodwill acquired during the period	16,614
Balance, December 31, 2014	17,435
Metasurg
Goodwill [Roll Forward]
Goodwill acquired during the period	469
Balance, December 31, 2014	469
U.S. Neurosurgery
Goodwill [Roll Forward]
Goodwill, gross		95,165
Accumulated impairment losses		0
Goodwill at December 31, 2013	95,165
Foreign currency translation	(4,248)
Balance, December 31, 2014	186,290
U.S. Neurosurgery | Confluent Surgical, Inc.
Goodwill [Roll Forward]
Goodwill acquired during the period	95,373
U.S. Neurosurgery | Medtronic MicroFrance
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Neurosurgery | Metasurg
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Instruments
Goodwill [Roll Forward]
Goodwill, gross		58,033
Accumulated impairment losses		0
Goodwill at December 31, 2013	58,033
Foreign currency translation	(1,290)
Balance, December 31, 2014	56,743
U.S. Instruments | Confluent Surgical, Inc.
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Instruments | Medtronic MicroFrance
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Instruments | Metasurg
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Extremities
Goodwill [Roll Forward]
Goodwill, gross		61,079
Accumulated impairment losses		0
Goodwill at December 31, 2013	61,079
Foreign currency translation	(1,369)
Balance, December 31, 2014	60,179
U.S. Extremities | Confluent Surgical, Inc.
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Extremities | Medtronic MicroFrance
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Extremities | Metasurg
Goodwill [Roll Forward]
Goodwill acquired during the period	469
U.S. Spine and Other
Goodwill [Roll Forward]
Goodwill, gross		56,325
Accumulated impairment losses		(46,738)
Goodwill at December 31, 2013	9,587
Foreign currency translation	(213)
Balance, December 31, 2014	9,374
U.S. Spine and Other | Confluent Surgical, Inc.
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Spine and Other | Medtronic MicroFrance
Goodwill [Roll Forward]
Goodwill acquired during the period	0
U.S. Spine and Other | Metasurg
Goodwill [Roll Forward]
Goodwill acquired during the period	0
International
Goodwill [Roll Forward]
Goodwill, gross		25,900
Accumulated impairment losses		0
Goodwill at December 31, 2013	25,900
Foreign currency translation	(1,170)
Balance, December 31, 2014	51,302
International | Confluent Surgical, Inc.
Goodwill [Roll Forward]
Goodwill acquired during the period	9,958
International | Medtronic MicroFrance
Goodwill [Roll Forward]
Goodwill acquired during the period	16,614
International | Metasurg
Goodwill [Roll Forward]
Goodwill acquired during the period	$ 0