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Business Combinations (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 11, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Cash paid for purchase   $ 380,080  
Definite-lived intangible assets:      
Goodwill   $ 485,685 $ 154,281
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 241,905    
Deferred tax assets 18,471    
Other assets 1,868    
Contingent consideration liability 18,800    
Deferred tax liabilities 75,160    
Other liabilities assumed 8,184    
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