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Fair Value (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Dec. 28, 2018
Assets    
Total assets at fair value $ 16,612 $ 14,402
Liabilities    
Total liabilities at fair value 11,289 11,403
Long term debt, carrying amount 150,000 225,000
Long term debt, fair value 165,000 235,000
Level 2    
Assets    
Cash surrender value of life insurance 16,474 14,320
Forward exchange contracts 138 82
Liabilities    
Deferred compensation 4,489 4,203
Level 3    
Liabilities    
Contingent consideration $ 6,800 $ 7,200