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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 27, 2020
Dec. 31, 2019
Assets:    
Money market instruments $ 3,926 $ 15,933
Financial assets at fair value 714,708  
Corporate Bonds    
Assets:    
Financial assets at fair value 259,887  
Treasury Bills    
Assets:    
Financial assets at fair value 270,091  
Asset-Backed Securities    
Assets:    
Financial assets at fair value 129,543  
Sovereign Bonds    
Assets:    
Financial assets at fair value 24,496  
Agency Bonds    
Assets:    
Financial assets at fair value 28,274  
Municipal Bonds    
Assets:    
Financial assets at fair value 2,417  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring    
Assets:    
Money market instruments 3,926  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Assets:    
Money market instruments 0  
Economic hedge forward contracts 313  
Liabilities:    
Economic hedge forward contracts 121  
Contingent consideration liabilities 0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Bonds    
Assets:    
Financial assets at fair value 259,887  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Treasury Bills    
Assets:    
Financial assets at fair value 270,091  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-Backed Securities    
Assets:    
Financial assets at fair value 129,543  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Sovereign Bonds    
Assets:    
Financial assets at fair value 24,496  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Agency Bonds    
Assets:    
Financial assets at fair value 28,274  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Municipal Bonds    
Assets:    
Financial assets at fair value 2,417  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Liabilities:    
Contingent consideration liabilities $ 0 $ 1,153