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Fair Values of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Dec. 31, 2018
Liabilities    
Contingent considerations - Long-term $ 14,998 $ 3,376
Fair Value Measurements Recurring    
Assets    
Cash equivalents 3,439 4,288
Assets, fair value 3,793 4,303
Liabilities    
Liabilities, fair value 18,788 3,558
Fair Value Measurements Recurring | Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 354 15
Fair Value Measurements Recurring | Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent considerations - Current 3,769  
Foreign currency forward contracts 21 182
Fair Value Measurements Recurring | Other Liabilities    
Liabilities    
Contingent considerations - Long-term 14,998 3,376
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Cash equivalents 3,439 4,288
Assets, fair value 3,439 4,288
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Assets, fair value 354 15
Liabilities    
Liabilities, fair value 21 182
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets    
Assets    
Foreign currency forward contracts 354 15
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Foreign currency forward contracts 21 182
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3)    
Liabilities    
Liabilities, fair value 18,767 3,376
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3) | Accrued Expenses and Other Current Liabilities    
Liabilities    
Contingent considerations - Current 3,769  
Fair Value Measurements Recurring | Significant Other Unobservable Inputs (Level 3) | Other Liabilities    
Liabilities    
Contingent considerations - Long-term $ 14,998 $ 3,376