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Business Combinations (Details) - USD ($)
$ in Thousands
Feb. 11, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Definite-lived intangible assets:          
Goodwill   $ 405,569 $ 154,281 $ 154,305 $ 154,273
Ellipse Technologies Inc [Member]          
Business Acquisition [Line Items]          
Cash paid for purchase $ 381,579        
Accounts receivable 7,148        
Inventory 22,451        
Other current assets 1,855        
Property, plant and equipment, net 6,725        
Definite-lived intangible assets:          
Goodwill 242,432        
Deferred tax assets 17,694        
Other assets 1,868        
Contingent consideration liability 18,800        
Deferred tax liabilities 75,999        
Other liabilities assumed 7,095        
Total purchase price of assets acquired and liabilities assumed, net 381,579        
Ellipse Technologies Inc [Member] | Developed technology [Member]          
Definite-lived intangible assets:          
Definite-lived intangible assets 133,900        
Ellipse Technologies Inc [Member] | Customer relationships [Member]          
Definite-lived intangible assets:          
Definite-lived intangible assets 33,200        
Ellipse Technologies Inc [Member] | Trade Names [Member]          
Definite-lived intangible assets:          
Definite-lived intangible assets $ 16,200