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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 12, 2017
Dec. 08, 2016
Jan. 05, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]            
Purchase price of acquisition       $ 0 $ 4,446 $ 312,158
Goodwill       $ 335,887 $ 337,751 327,724
InPharmics            
Acquired Finite-Lived Intangible Assets [Line Items]            
Purchase price of acquisition $ 5,000          
Cash acquired from Acquisition 300          
Long-term liability for potential settlement of performance obligations 500          
Intangibles $ 1,900          
Aesynt            
Acquired Finite-Lived Intangible Assets [Line Items]            
Purchase price of acquisition     $ 271,458      
Cash acquired from Acquisition     8,200      
Acquisition related costs     $ 9,300     6,400
Ateb            
Acquired Finite-Lived Intangible Assets [Line Items]            
Purchase price of acquisition   $ 40,700        
Cash acquired from Acquisition   $ 900        
Acquisition-related costs           $ 1,700