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Fair Value - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 27, 2015
Dec. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 129 $ 1,934
Marketable securities 4,561  
Life insurance policies 21,152 20,520
Total assets measured at fair value 25,842 22,454
Redeemable noncontrolling interest 29,976 28,419
Contingent consideration 2,831 2,828
Total liabilities measured at fair value 32,807 31,247
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Marketable securities 4,561  
Life insurance policies 0 0
Total assets measured at fair value 4,561 0
Redeemable noncontrolling interest 0 0
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 129 1,934
Marketable securities 0  
Life insurance policies 21,152 20,520
Total assets measured at fair value 21,281 22,454
Redeemable noncontrolling interest 0 0
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
Marketable securities 0  
Life insurance policies 0 0
Total assets measured at fair value 0 0
Redeemable noncontrolling interest 29,976 28,419
Contingent consideration 2,831 2,828
Total liabilities measured at fair value $ 32,807 $ 31,247