Business Segment, Product and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Entity Wide Information Revenue From External Customer [Line Items]
Total Revenue	$ 236,210	$ 202,910	$ 451,314	$ 395,293
Spinal Hardware [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Total Revenue	171,242	140,055	323,199	271,277
Surgical Support [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Total Revenue	$ 64,968	$ 62,855	$ 128,115	$ 124,016