Business Segment, Product and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Entity Wide Information Revenue From External Customer [Line Items]
Total Revenue	$ 239,649	$ 200,538	$ 690,963	$ 595,831
Spinal Hardware [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Total Revenue	162,831	138,948	486,030	410,225
Surgical Support [Member]
Entity Wide Information Revenue From External Customer [Line Items]
Total Revenue	$ 76,818	$ 61,590	$ 204,933	$ 185,606