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Fair Value Measurements (Level 3 Contingent Purchase Price) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value Measurement, Contingent Purchase Price [Roll Forward]        
Balance at beginning of period     $ 140,712  
Balance at end of period $ 135,907   135,907  
Fair Value, Measurements, Recurring [Member]        
Fair Value Measurement, Contingent Purchase Price [Roll Forward]        
Balance at beginning of period     351,134  
Balance at end of period 204,307   204,307  
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurement, Contingent Purchase Price [Roll Forward]        
Balance at beginning of period 207,160 $ 360,780 351,134 $ 302,363
Settlements (3,600) 0 (179,250) 0
Fair value adjustment to contingent purchase prices included in net loss 747 8,214 14,423 28,731
Balance at end of period 204,307 368,994 204,307 368,994
Tenaxis [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurement, Contingent Purchase Price [Roll Forward]        
Fair value of contingent purchase price 0 0 0 37,900
Annovation [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurement, Contingent Purchase Price [Roll Forward]        
Fair value of contingent purchase price $ 0 $ 0 $ 18,000 $ 0