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Fair Value Measurements (Level 3 Contingent Purchase Price) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value Measurment, Contingent Purchase Price [Roll Forward]        
Balance at beginning of period     $ 140,712  
Balance at end of period $ 147,260   147,260  
Fair Value, Measurements, Recurring [Member]        
Fair Value Measurment, Contingent Purchase Price [Roll Forward]        
Balance at beginning of period     351,134  
Balance at end of period 207,160   207,160  
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurment, Contingent Purchase Price [Roll Forward]        
Balance at beginning of period 369,552 $ 304,627 351,134 $ 302,363
Settlements (174,550) 0 (175,650) 0
Fair value adjustment to contingent purchase prices included in net loss. 12,158 17,353 13,676 19,617
Balance at end of period 207,160 360,780 207,160 360,780
Tenaxis Medical [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurment, Contingent Purchase Price [Roll Forward]        
Fair value of contingent purchase price 0 38,800 0 38,800
Annovation [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurment, Contingent Purchase Price [Roll Forward]        
Fair value of contingent purchase price $ 0 $ 0 $ 18,000 $ 0