Segment And Geographic Information (Revenues By Market Category) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Total revenues	$ 193,329	$ 178,595	$ 374,370	$ 351,293
Orthopedics [Member]
Total revenues	80,579	72,819	152,813	143,006
Neurosurgery [Member]
Total revenues	72,102	66,306	140,460	131,080
Instruments [Member]
Total revenues	$ 40,648	$ 39,470	$ 81,097	$ 77,207