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FAIR VALUE - Contingent Consideration (Details) - Contingent Consideration - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 298 $ 3,621
Additions 3,315 296
Payments 0 (3,606)
Foreign currency translation (213) 0
Reversal of previously recorded contingent liability 0 (15)
Ending balance $ 3,400 $ 296