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Fair Value - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 21 $ 21
Other assets:    
Life insurance policies 26,240 26,358
Total assets measured at fair value 26,261 26,379
Other current liabilities:    
Contingent consideration 3,053 298
Total liabilities measured at fair value 3,053 298
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 0 0
Other current liabilities:    
Contingent consideration 0 0
Total liabilities measured at fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 21 21
Other assets:    
Life insurance policies 26,240 26,358
Total assets measured at fair value 26,261 26,379
Other current liabilities:    
Contingent consideration 0 0
Total liabilities measured at fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 0 0
Other current liabilities:    
Contingent consideration 3,053 298
Total liabilities measured at fair value $ 3,053 $ 298